Question 1: what is the current drawn by electric heater rated 1800 watts at 120 volts?
- 15 Amperes
- 10 Amperes
- 18 Amperes
- 8 Amperes
NEC CODE
NEC 2023
Ohm's Law Practice Test 1
Take a Practice test on Ohms law Practice quiz questions - 1
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Electrical Practice Questions
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The National Electrical Code (NFPA 70) is the benchmark standard for safe electrical installation in the US. It is updated every 3 years by the NFPA.
Study the edition adopted by your state. As of 2025, most states use the 2020 or 2023 NEC. These tests are written to the 2023 edition.
The most tested articles are 100 (Definitions), 200–250 (Wiring & Grounding), 300–314 (Wiring Methods), 400–411 (Conductors), 430 (Motors), and 700–701 (Emergency Systems).
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TimeOhm's Law Practice Test 1 — Question List
Question 2: A 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 ..............
- increases
- decreases
- remains same
Question 3: A 6 AWG THHN conductor is good for use for how many KW of load at 120 volts?
- 7.8
- 7800
- 780
- 78
NEC Reference: NEC 310.15(B)(16)
Question 4: A 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?
- 0.87 amperes
- 0.97 amperes
- 0.92 amperes
- 0.8 amperes
Question 5: How much power is consumed by 240 volts circuit that draws 20 A current?
- 4.8 KW
- 4800 KW
- 3500 W
- 3800 KW
Question 6: An ohm meter indicates a resistance of 120 volt electric heater to be 8 ohms. what is the current drawn by the heater?
- 15 Amperes
- 10 Amperes
- 8 Amperes
- 18 Amperes
Question 7: If a single phase circuit feeding residential electric heaters, what is the maximum allowable wattage that can be connected?
- 2880 Watts
- 3600 Watts
- 2400 Watts
- 1800 Watts
Question 8: A 3000 watts electric oven is connected to 480 volt circuit what is the resistance of heating element?
- 76.8 ohms
- 6.25 ohms
- 58.3 ohms
- 12.8 ohms
NEC Reference: NEC 76.8
Question 9: An electric motor rated at 3600 watt is connected to 240 V single phase , 2 wire circuit what is the current flow in the circuit?
- 15 amperes
- 10 amperes
- 7.5 amperes
- 12 amperes
Question 10: An electric heater with a resistance of 16 ohms, which draws a current of 7 amps. What is the minimum wattage of electric heater?
- 784 watts
- 112 watts
- 786 watts
- 156 watts
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