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BASIC NEC 2023

Ohm's Law Practice Test 1

Take a Practice test on Ohms law Practice quiz questions - 1

TOPICS COVERED

Electrical Practice Questions

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How to Use This Practice Test

This Ohm's Law Practice Test 1 has 11 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.

Tip: Work through Ohm's Law problems on paper — don't just read the answers, calculate them yourself.

Topics covered: Voltage, current, resistance, Ohm's Law, series/parallel circuits, and electrical safety.
Passing score: Aim for 90%+ on basic theory — these fundamentals underpin every advanced topic.
Questions: 11 multiple-choice, one correct answer each

10

Questions

17 min

Time

70%

Pass

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Ohm's Law Practice Test 1 — Question List

Question 1: what is the current drawn by electric heater rated 1800 watts at 120 volts?

15 Amperes
10 Amperes
18 Amperes
8 Amperes

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

EXAM CARD BASIC

Questions10

Time limit17 min

Pass score70%

Code editionNEC 2023

DifficultyIntermediate

Last reviewedJun 2026

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Source: NEC 2026 (NFPA 70)