Ohmite Resistors

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5 Pcs Ohmite Resistor 220K Ohm 5 Watt 10 Carbon Composition Resistor
5 Pcs Ohmite Resistor 220K Ohm 5 Watt 10 Carbon Composition Resistor
$6.18
quality
3 pieces Adjustable Resistor Ohmite Dividohm p n 0795 New htf
3 pieces Adjustable Resistor Ohmite Dividohm p n 0795 New htf
$45.00
quality
5  OHMITE TYPE 270 FIXED RESISTORS NOS
5 OHMITE TYPE 270 FIXED RESISTORS NOS
$28.00
quality
1 NEW OHMITE D225K25R LUG RESISTOR NIB
1 NEW OHMITE D225K25R LUG RESISTOR NIB
$17.99
quality
Heico Ohmite Mil Spec Resistor Part  270 100M 40 R4OHMJCT 200 Ohm 400 Ohm
Heico Ohmite Mil Spec Resistor Part 270 100M 40 R4OHMJCT 200 Ohm 400 Ohm
$74.96
quality
NEW OHMITE D225K25R 25OHM 225W RESISTOR D444766
NEW OHMITE D225K25R 25OHM 225W RESISTOR D444766
$10.00
quality
Ohmite Resistors 850F25R 50W 25Ohms
Ohmite Resistors 850F25R 50W 25Ohms
$8.95
quality
Ohmite C300KR25 25 Ohm 300W Fixed Power Resistor Vitreous Enamel w Lugs NEW
Ohmite C300KR25 25 Ohm 300W Fixed Power Resistor Vitreous Enamel w Lugs NEW
$21.95
quality
Ohmite C300KR31 31 Ohm 300W Fixed Power Resistor Vitreous Enamel w Lugs NEW
Ohmite C300KR31 31 Ohm 300W Fixed Power Resistor Vitreous Enamel w Lugs NEW
$21.95
quality
6 Ohmite L12J1K5 270 Series 1500 Ohms 12W 5 Vitreous Enamel Power Resistors
6 Ohmite L12J1K5 270 Series 1500 Ohms 12W 5 Vitreous Enamel Power Resistors
$19.99
quality
LOT OF 3 OHMITE RESISTORS D25K15R NEW NIB
LOT OF 3 OHMITE RESISTORS D25K15R NEW NIB
$19.96
quality
Ohmite 225W 25Ohm Wirewound Resistor D225K25R NIB
Ohmite 225W 25Ohm Wirewound Resistor D225K25R NIB
$17.99
quality
Ohmite Resistor 50 Watt 50 Ohm 0563 LOT NOS New Old Stock
Ohmite Resistor 50 Watt 50 Ohm 0563 LOT NOS New Old Stock
$29.99
quality
Ohmite Resistor 50 Watt 250 Ohm 0568 NOS New Old Stock
Ohmite Resistor 50 Watt 250 Ohm 0568 NOS New Old Stock
$4.99
quality
Ohmite Resistor 50 Watt 100 Ohm 0565 LOT NOS New Old Stock
Ohmite Resistor 50 Watt 100 Ohm 0565 LOT NOS New Old Stock
$24.99
quality
Ohmite Resistor 50 Watt 2k Ohm 0574 LOT NOS New Old Stock
Ohmite Resistor 50 Watt 2k Ohm 0574 LOT NOS New Old Stock
$19.99
quality
Ohmite Resistor 50 Watt 10k Ohm 0581 LOT NOS New Old Stock
Ohmite Resistor 50 Watt 10k Ohm 0581 LOT NOS New Old Stock
$9.99
quality
Ohmite Resistor 50 Watt 5k Ohm 0411 LOT NOS New Old Stock
Ohmite Resistor 50 Watt 5k Ohm 0411 LOT NOS New Old Stock
$9.99
quality
Ohmite Resistor 50 Watt 4k Ohm 0410 LOT NOS New Old Stock
Ohmite Resistor 50 Watt 4k Ohm 0410 LOT NOS New Old Stock
$9.99
quality
New Ohmite Resistor RJS10K 10K Ohms 070A Series 9022
New Ohmite Resistor RJS10K 10K Ohms 070A Series 9022
$25.00
quality
New Ohmite DidvidOhm Variable Resistor 1000Ohm 50W D50K1K0 Adjustable Tap
New Ohmite DidvidOhm Variable Resistor 1000Ohm 50W D50K1K0 Adjustable Tap
$14.95
quality
OHMITE Resistor 3758 270 12D 57 15ohm 12W
OHMITE Resistor 3758 270 12D 57 15ohm 12W
$8.75
quality
New Ohmite Resistor 150Ohm 100W L100J150
New Ohmite Resistor 150Ohm 100W L100J150
$14.95
quality
New Ohmite Resistor 150Ohm 225W L225J150
New Ohmite Resistor 150Ohm 225W L225J150
$14.95
quality
New Ohmite Resistor 50 Ohm 100W L100J50R
New Ohmite Resistor 50 Ohm 100W L100J50R
$9.95
quality
Ohmite 36 400W Resistor
Ohmite 36 400W Resistor
$600.00
quality
OHMITE WIRE WOUND RESISTOR 55 WATT 39 OHMS MIL SPEC RW35V3R9  24pcs
OHMITE WIRE WOUND RESISTOR 55 WATT 39 OHMS MIL SPEC RW35V3R9 24pcs
$48.00
quality
Ohmite RJS80R Resistor Element 80 Ohm 0790 Amp
Ohmite RJS80R Resistor Element 80 Ohm 0790 Amp
$49.99
quality
Ohmite 270 Series Vitreous Enamel Power Resistor 225 WATT 50 ohm L225J50R
Ohmite 270 Series Vitreous Enamel Power Resistor 225 WATT 50 ohm L225J50R
$14.24
quality
Miller 147902 Ohmite Resistor WW FXD 30W 2500 NEW
Miller 147902 Ohmite Resistor WW FXD 30W 2500 NEW
$24.00
quality
Ohmite Resistor 5K  225 W L225J5K0 Lot of 2 New
Ohmite Resistor 5K 225 W L225J5K0 Lot of 2 New
$25.00
quality
Ohmite Resistor 10  225 W L225J1K5 Lot of 3 New
Ohmite Resistor 10 225 W L225J1K5 Lot of 3 New
$30.00
quality
Ohmite Resistor 10  225 W L225J10R Lot of 2 New
Ohmite Resistor 10 225 W L225J10R Lot of 2 New
$25.00
quality
OHMITE 23J500E WIREWOUND RESISTOR 20 SERIES 3 W 500 OHMS 5 2 BX
OHMITE 23J500E WIREWOUND RESISTOR 20 SERIES 3 W 500 OHMS 5 2 BX
$1.50
quality
OHMITE 0600B RESISTOR WIREMOLD 10 0HMS 100 WATTS NIB
OHMITE 0600B RESISTOR WIREMOLD 10 0HMS 100 WATTS NIB
$13.95
quality
OHMITE 0L1805 CARBON RESISTOR 18 0HMS 1 2 W 5 NNB
OHMITE 0L1805 CARBON RESISTOR 18 0HMS 1 2 W 5 NNB
$2.45
quality
OHMITE 0L2415 CARBON RESISTOR 240 0HMS 1 2 W 5 NNB
OHMITE 0L2415 CARBON RESISTOR 240 0HMS 1 2 W 5 NNB
$2.45
quality
OHMITE 2745 RESISTOR 24 0HMS 3 WATTS NNB
OHMITE 2745 RESISTOR 24 0HMS 3 WATTS NNB
$1.95
quality
OHMITE 42J10R RESISTOR 10 0HMS 2 WATTS NNB
OHMITE 42J10R RESISTOR 10 0HMS 2 WATTS NNB
$1.45
quality
OHMITE 45JR75 RESISTOR 075 0HMS 5 WATTS NNB
OHMITE 45JR75 RESISTOR 075 0HMS 5 WATTS NNB
$2.50
quality
OHMITE 810F4R0 RESISTOR 4 0HMS 10 WATTS NIB
OHMITE 810F4R0 RESISTOR 4 0HMS 10 WATTS NIB
$4.95
quality
Ohmite Dividohm 1358 25 Ohm Wire Wound Adjustabel Resistor
Ohmite Dividohm 1358 25 Ohm Wire Wound Adjustabel Resistor
$15.00
quality
OHMITE BROWN DEVIL MALLORY ELECTRAD Ceramic Wirewound Resistor Vintage Tube Amp
OHMITE BROWN DEVIL MALLORY ELECTRAD Ceramic Wirewound Resistor Vintage Tube Amp
$9.99
quality
OHMITE 100 Ceramic Wirewound Resistor Vintage Tube 7 PIECES
OHMITE 100 Ceramic Wirewound Resistor Vintage Tube 7 PIECES
$9.99
quality
New no box OHMITE 210 100M 40 DIVIDOHM RESISTOR 3 OHMS
New no box OHMITE 210 100M 40 DIVIDOHM RESISTOR 3 OHMS
$2.50
quality
OHMite D225K3RO Resistor
OHMite D225K3RO Resistor
$12.99
quality
Resistor 10 Watt 750 ohms tested 770 OR 50 ohm tested 48 YOUR CHOICE
Resistor 10 Watt 750 ohms tested 770 OR 50 ohm tested 48 YOUR CHOICE
$6.49
quality
OHMITE 1365 225W 10000 Ohm RESISTOR 10K NEW 4 per lot
OHMITE 1365 225W 10000 Ohm RESISTOR 10K NEW 4 per lot
$29.99
quality
OHMITE D225K1R0 WIREWOUND RESISTOR DIVIDOHM VITREOUS ENAMELED 1 OHM 225 WATT
OHMITE D225K1R0 WIREWOUND RESISTOR DIVIDOHM VITREOUS ENAMELED 1 OHM 225 WATT
$20.00
quality
NEW IN BOX OHMITE 0411 FIXED RESISTOR
NEW IN BOX OHMITE 0411 FIXED RESISTOR
$11.99
quality
OHMITE 0X821KE RESISTOR 8200HM 1W 300V LOT OF 25 NIB
OHMITE 0X821KE RESISTOR 8200HM 1W 300V LOT OF 25 NIB
$14.99
quality
OHMITE LUG RESISTOR E300K2R0 NEW E300K2R0
OHMITE LUG RESISTOR E300K2R0 NEW E300K2R0
$30.00
quality
Lot of 4 Ohmite L25J1R0E Wirewound Power Resistors 1 Ohms 25W 625VAC
Lot of 4 Ohmite L25J1R0E Wirewound Power Resistors 1 Ohms 25W 625VAC
$3.99
quality
OHMITE RESISTOR D75K25R 25 OHMS NO0772 75 WATT 8252 NEW D75K25R 0772
OHMITE RESISTOR D75K25R 25 OHMS NO0772 75 WATT 8252 NEW D75K25R 0772
$15.00
quality
Ohmite L225J10R Resistor 225 Watts 10 Ohm
Ohmite L225J10R Resistor 225 Watts 10 Ohm
$9.99
quality
OHMITE 300W 20 OHM RESISTOR 2614 NEW 2614
OHMITE 300W 20 OHM RESISTOR 2614 NEW 2614
$35.00
quality
OHMITE LUG RESISTOR 300W 10OHM E300K10R NEW E300K10R
OHMITE LUG RESISTOR 300W 10OHM E300K10R NEW E300K10R
$25.00
quality
OHMITE RESISTOR 4000 OHMS NO 0410 NEW SURPLUS 0410
OHMITE RESISTOR 4000 OHMS NO 0410 NEW SURPLUS 0410
$10.00
quality
Ohmite 270 25K 40 No0207 12K Ohm 25 Watt Resistor Used
Ohmite 270 25K 40 No0207 12K Ohm 25 Watt Resistor Used
$3.68
quality
Ohmite Resistor L175J5K0 175W 5000 OHM
Ohmite Resistor L175J5K0 175W 5000 OHM
$13.99
quality
Ohmite Resistor No 0563 DIVIDOHM 210 50K 40 50 OHMS 50 WATT 8027
Ohmite Resistor No 0563 DIVIDOHM 210 50K 40 50 OHMS 50 WATT 8027
$7.99
quality
OHMITEL550J27RVitreous Enameled Power Wirewound Resistor50W27Ohm1 Lot20pcs
OHMITEL550J27RVitreous Enameled Power Wirewound Resistor50W27Ohm1 Lot20pcs
$50.00
quality
Ohmite L50J150 150 Ohm Wirewound Resistor
Ohmite L50J150 150 Ohm Wirewound Resistor
$15.00
quality
NIB OHMITE 210 175P 46 Resistor 175 Watts 5 OHMS
NIB OHMITE 210 175P 46 Resistor 175 Watts 5 OHMS
$6.49
quality
Ohmite 15kOhm 300W Ceramic Wirewound Resistor RNS1K5 NIB
Ohmite 15kOhm 300W Ceramic Wirewound Resistor RNS1K5 NIB
$141.16
quality
Ohmite 12 Ohm 50W Ceramic Wirewound Resistor RJS12R NNB
Ohmite 12 Ohm 50W Ceramic Wirewound Resistor RJS12R NNB
$29.99
quality
LUG RESISTOR OHMITE 225 WATT NEW OLD STOCK
LUG RESISTOR OHMITE 225 WATT NEW OLD STOCK
$9.99
quality
Ohmite Little Devils Full of Resistors 2 5 Drawer Storage Cabinets Bakelite
Ohmite Little Devils Full of Resistors 2 5 Drawer Storage Cabinets Bakelite
$50.00
quality
OHMITE RESISTOR 270 100M 40 50 OHMS USED
OHMITE RESISTOR 270 100M 40 50 OHMS USED
$10.00
quality
TK20P4R00JE Thick Film Resistors Through Hole 20watt 4ohm 5 50ppm
TK20P4R00JE Thick Film Resistors Through Hole 20watt 4ohm 5 50ppm
$3.99
quality
OHMITE 100K 100W 5 VITREOUS ENAMEL POWER RESISTOR
OHMITE 100K 100W 5 VITREOUS ENAMEL POWER RESISTOR
$9.99
quality
Ohmite L100J50K 50K Ohm 100W 5 Vitreous Enamel Power Resistor Lug Terminal
Ohmite L100J50K 50K Ohm 100W 5 Vitreous Enamel Power Resistor Lug Terminal
$14.00
quality
LOT 6 OHMITE 470N 100M 40 6 1 2IN LENGTH CERAMIC RESISTOR 10R00J D202936
LOT 6 OHMITE 470N 100M 40 6 1 2IN LENGTH CERAMIC RESISTOR 10R00J D202936
$20.00
quality
LOT 4 OHMITE 65254 CERAMIC RESISTOR 8 1 2IN LENGTH 30000OHM OHMS D202942
LOT 4 OHMITE 65254 CERAMIC RESISTOR 8 1 2IN LENGTH 30000OHM OHMS D202942
$30.00
quality
30x Ohmite 45JR10 5W 1 Silicone Ceramic Conformal Axial Wirewound Resistor
30x Ohmite 45JR10 5W 1 Silicone Ceramic Conformal Axial Wirewound Resistor
$26.99
quality
Ohmite PFE5KR180 POWR RIB Resistor NEW
Ohmite PFE5KR180 POWR RIB Resistor NEW
$99.95
quality
Ohmite 50 Ohm Brown Power Resistor x1
Ohmite 50 Ohm Brown Power Resistor x1
$5.97
quality
New O S Ohmite vitreous enameled resistor 0962 100 watt 1K0 ohms D100K1K0
New O S Ohmite vitreous enameled resistor 0962 100 watt 1K0 ohms D100K1K0
$12.99
quality
OHMITE RESISTOR STOCK 0964 WATTS 10  NIB NOS
OHMITE RESISTOR STOCK 0964 WATTS 10 NIB NOS
$12.99
quality
NOS Lot of 44 Ohmite Vitreous Enameled Resistors 50W 50K 20K Varies New In Box
NOS Lot of 44 Ohmite Vitreous Enameled Resistors 50W 50K 20K Varies New In Box
$195.00
quality
OHMITE L50J1K0 WIREWOUND RESISTOR 1K OHM 1000 OHMS 50W NIB
OHMITE L50J1K0 WIREWOUND RESISTOR 1K OHM 1000 OHMS 50W NIB
$9.95
quality
OHMITE L225J50R 225WATT 50OHM LOT OF 2 RESISTORS NEW
OHMITE L225J50R 225WATT 50OHM LOT OF 2 RESISTORS NEW
$25.00
quality
Resistor Power w Mount Heatsink 120 ohm 11 22 watt Ohmite 5 Quantity 1
Resistor Power w Mount Heatsink 120 ohm 11 22 watt Ohmite 5 Quantity 1
$3.91
quality
2pc Ohmite 39ohm 325W Wirewound Resistor 93J39R
2pc Ohmite 39ohm 325W Wirewound Resistor 93J39R
$1.75
quality
New 50W 10 ohm 1 Metal Mite Wirewound Resistors Ohmite 850F10R Aluminum Housed
New 50W 10 ohm 1 Metal Mite Wirewound Resistors Ohmite 850F10R Aluminum Housed
$7.99
quality
Ohmite TA1K0PH50R0KE Resistor 50 ohms Power 1km 10 Resistance Tolerance
Ohmite TA1K0PH50R0KE Resistor 50 ohms Power 1km 10 Resistance Tolerance
$130.00
quality
OHMITE VITREOUS ENAMELED RESISTOR D100K5K0 100W 5K OHMS
OHMITE VITREOUS ENAMELED RESISTOR D100K5K0 100W 5K OHMS
$12.00
quality
20 Pcs Ohmite 20000 ohm 2 Watt 5 RC42GF126J Carbon Comp Resistor
20 Pcs Ohmite 20000 ohm 2 Watt 5 RC42GF126J Carbon Comp Resistor
$15.00
quality
Ohmite Vitreous Enameled Resistor 63 Ohm 300 Watt
Ohmite Vitreous Enameled Resistor 63 Ohm 300 Watt
$29.95
quality
OHMITE 281H 300P 45 4R000KRESISTOR WIREWOUND POWER 4OHM 10 1 lot of 10pcs
OHMITE 281H 300P 45 4R000KRESISTOR WIREWOUND POWER 4OHM 10 1 lot of 10pcs
$175.00
quality
OHMITE 300W 31 OHMS VITREOUS ENAMELED RESISTOR 2516 NEW
OHMITE 300W 31 OHMS VITREOUS ENAMELED RESISTOR 2516 NEW
$31.62
quality
OHMITE 300W 40 OHMS VITREOUS ENAMELED RESISTOR 2517 NEW
OHMITE 300W 40 OHMS VITREOUS ENAMELED RESISTOR 2517 NEW
$36.59
quality
OHMITE DIVIDOHM RESISTOR NO 1360 100 OHMS NEW NO BOX 1360
OHMITE DIVIDOHM RESISTOR NO 1360 100 OHMS NEW NO BOX 1360
$20.00
quality
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Ohmite Resistors

See More About:    Ohmite Resistor        
680V over OHMITE 100 ohm 225W resistor

The Test Methods and Experiences of 8 Resistors

1. Fixed Resistor Testing.

A. Connect the two probes(regardless of positive and negative) to the pins of resistors respecially, the actual resistance value will be measured. In order to improve the measurement accuracy, the measured resistance should be based on the size of the nominal value to select the range. As the scale of the nonlinear Ohm's block, dividing it in the middle of a more refined, pointer indicates the value should be possible to scale fell on the middle position, that is the start of full scale of 20% to 80% within the arc to make the measurements more accurate. According to a different level of resistance error. Reading between the nominal resistance were allowed ± 5%, ± 10% or ± 20% error. If we do not match, beyond the error range, then the resistance value change the value.

B. Note: When you are testing, particularly in the resistance measured over tens of kΩ resistor, hands do not touch the probe and resistance of the conductive part; be detected in the welding of the resistance from the circuit down, at least open a welding head, in order to avoid circuit The impact on other components of the test, resulting in measurement residual; the resistance value of color ring resistor can be able to determined by color ring marks, but is best to test the actual resistance using a multimeter.

2. Cement Resistance Testing.

Detection of resistance of cement and precautions to ordinary fixed resistor with the same test.

3. Fuse Resistors Test.

In the circuit, when the fuse resistor fuse open, you can make judgments based on experience: If it is found fuse resistors or charred black surface, it can be concluded that the overload rating of the current through it many times over due; If the surface without any trace of the open, it indicates that the current flow is equal to or just greater than the rated fuse value of sales. For the surface without any trace of the fuse resistor to judge good or bad, can make use of the multimeter to measure the R × 1 block, to ensure accurate measurement, it should fuse resistors from the circuit on one end of the next weld. If the measured resistance is infinite, then the fuse has failed open circuit resistor, if the measured resistance falls far short of the nominal value, that value of resistance change, we should not be used. In the maintenance of practice found that a small number of resistors in the circuit fuse is short breakdown phenomenon, attention should also be detected.

4. Potentiometer Detection.

Check the potentiometer, the first to turn the rotating handle, turn handle to see whether the smooth rotation, the switch is flexible, switch-pass, short "clicks" is crisp, and listen to the potentiometer and the resistance of the contact point within the body of friction sound, if any "imperfections" sound, indicating poor quality. Test with a multimeter, the first based on the size of the measured resistance of the potentiometer, the appropriate choice of a good multimeter resistance gear, and then according to the following method for testing.

A. Measured with a multimeter's ohm block "1" "2" at both ends, the reading should be nominal for the potentiometer resistance, such as the meter pointer does not move a lot of difference, or resistance, it indicates that the potentiometer is damaged.

B. Detect whether the activities of the potentiometer arm and the resistance of film contact is good or not. The ohm meter test block with "1" "2" ("2" "3") ends of the potentiometer shaft counterclockwise rotation to close the "off" position, when the resistance value as possible. Handle clockwise rotation axis and then slowly, the resistance value should be increased gradually, the pointer in the header should be a smooth move. When the spin axis of the handle to the extreme position of "3", the resistance should be close to the nominal value of the potentiometer. If the multimeter pointer handle potentiometer shaft rotation in the process of jumps, indicating active fault contacts are bad.

5. Positive Temperature Coefficient Thermistor (PTC) Detection.

When detecting, with a multimeter R × 1 block, concrete and two-step operation:

A. Room Temperature Testing (room temperature close to 25 ℃): the two probes touch the two pins PTC thermistors measure the actual resistance, and with the relative ratio of the nominal resistance, the difference between the two is the normal within the ± 2Ω. If the nominal resistance and the resistance of the actual difference is too large, then the performance is bad or damaged.

B. Heating Test: at room temperature, on the basis of the tests are normal, then a second step tests - heat detection, to a heat source (such as electric iron) near the PTC thermistor to its heating, while monitoring the resistance with a multimeter if the value increases with increasing temperature, and if so, that the normal thermal resistance, if resistance did not change, indicating that its performance became inferior and can not be used. Careful not to heat with the PTC thermistor by too close or direct contact with the thermistor in order to prevent their ruined.

6. Negative Temperature Coefficient Thermistor (NTC) Testing.

(1) Measured nominal resistance value Rt NTC thermistor with a multimeter measuring methods and measuring the same way as ordinary fixed resistor, which according to the nominal resistance of NTC thermistor select the appropriate power block can be directly measured actual Rt value. But NTC thermistor is sensitive to temperature, so the test should note the following:

A. Rt is the manufacturer at an ambient temperature measured at 25 ℃, so the Rt measured with a multimeter when the ambient temperature should also be close to 25 ℃, in order to ensure the credibility of the test.

B. Measurement of power shall not exceed the specified value, so that the current measurement error caused by thermal effects.

C. It is operating correctly. Test, and hold your hands to prevent the body temperature of the test impact.

(2) Estimate the temperature coefficient "at"

First measured the value of t1 resistance Rt1 at room temperature, then electric soldering iron for heat, close to the thermistor Rt, measure the resistance RT2, also measured with a thermometer at this time the surface of the thermistor RT and then calculated the average temperature t2.

7. Varistor Testing.

R × 1k with a multimeter to measure the varistor block between the two pins is, the reverse insulation resistance, are infinite, otherwise, that leakage current. If the measured resistance is very small, indicating varistor is damaged, can not be used.

8. Photosensitive Resistance Testing.

A. With a black piece of paper to cover the window light sensitive resistor, when the multimeter pointer remained fixed, the resistance approaches infinity. This value shows the bigger the better performance of photosensitive resistance. If this value is very small or close to zero, indicating photoresistor has burn damage, can not continue to use.

B. Will be a light transmittance of the window aligned photosensitive resistance, when the multimeter pointer swing should be more substantial, more resistance was significantly reduced. The smaller this value the better the performance that photosensitive resistance. If this value is large or even infinite, indicating that the resistance of the internal open-photosensitive damage, can no longer continue.

C. The photosensitive resistor light window light rays aligned with the black pieces of paper on top of the window shade photoresistors shaking, it stopped by the light, this time with the black pieces of paper multimeter pointer should be shaking and side to side. If the meter pointer position does not always stop with the paper in a rock and swing, indicating resistance of the photosensitive photosensitive materials have been damaged.

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