Ohms Law Quiz Practice Test Questions1
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Question 1 of 10
1. Question
1 pointswhat is the current drawn by electric heater rated 1800 watts at 120 volts?
Correct
Incorrect
I = W / E
= 1800 / 120
= 15 Amperes

Question 2 of 10
2. Question
1 pointsA 120 volt circuit which has a resistance of 12 ohms draws a current of 10 A. If the voltage is doubled, the current in the circuit …………..
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Question 3 of 10
3. Question
1 pointsA 6 AWG THHN conductor is good for use for how many KW of load at 120 volts?
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Incorrect
Wattage = E * I
E = 120 volts
Refer: NEC Table 310.15(B)(16)
for 6 AWG THHN the allowable ampacity is 65 A
Total KW = 120 * 65 / 1000 = 7.8 kW

Question 4 of 10
4. Question
1 pointsA light bulb has a rating of 100 W at 115 volts. What is the current drawn by it when it is connected to source voltage of 115 volts?
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Incorrect
Current Drawn by the bulb = E/I = 100 / 115 = 0.87 Amperes

Question 5 of 10
5. Question
1 pointsHow much power is consumed by 240 volts circuit that draws 20 A current?
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Incorrect
P = E * I = 240 * 20 = 4800 W

Question 6 of 10
6. Question
1 pointsAn ohm meter indicates a resistance of 120 volt electric heater to be 8 ohms. what is the current drawn by the heater?
Correct
Incorrect
I = V/R
= 120 / 8
= 15 Amperes

Question 7 of 10
7. Question
1 pointsIf a single phase circuit feeding residential electric heaters, what is the maximum allowable wattage that can be connected?
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Incorrect
Power = E * I
= 240 * 15 = 3600 Watts
electrical heaters are a continuous load so total connected load be 80% of circuit rating
Total allowable wattage = 3600 * 0.8 = 2880 Watts

Question 8 of 10
8. Question
1 pointsA 3000 watts electric oven is connected to 480 volt circuit what is the resistance of heating element?
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Incorrect
P = E^{2} / R
R = E^{2} / P
= ( 480 * 480) / 3000
= 76.8 ohms

Question 9 of 10
9. Question
1 pointsAn electric motor rated at 3600 watt is connected to 240 V single phase , 2 wire circuit what is the current flow in the circuit?
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Incorrect
Answer: 15 amperes
Current I = P / E
= 4600 / 240
= 15 amperes

Question 10 of 10
10. Question
1 pointsAn electric heater with a resistance of 16 ohms, which draws a current of 7 amps. What is the minimum wattage of electric heater?
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Incorrect
P = I^{2} * R = ( 7 * 7 ) * 16 = 784 watts