A bank of 202 exam style questions for electrician licensing exam candidates. Every answer comes with a four part rationale: why the correct answer is right, why the others are wrong, the principle behind it, and the takeaway to remember.
Sample question 1. THEORY: Ohm's Law states Voltage equals:
A. Current x Resistance
B. Power x Time
C. Resistance / Current
D. Current / Resistance
Answer: A. Correct: Ohm's Law states Voltage equals Current times Resistance (V = I x R). Why the other choices are wrong: Current divided by Resistance and Resistance divided by Current invert the relationship and give meaningless units; Power times Time describes energy, not voltage. Principle: Voltage is the electrical pressure produced when current flows against resistance. Takeaway: V = I x R.
Sample question 2. THEORY: Electrical current is measured in:
A. Volts
B. Watts
C. Ohms
D. Amperes
Answer: D. Correct: Electrical current is measured in amperes, the rate of charge flow past a point. Why the other choices are wrong: Volts measure electrical pressure, Ohms measure resistance, and Watts measure power, none of which express current. Principle: One ampere equals one coulomb of charge passing a point each second. Takeaway: Current is measured in amperes.
Sample question 3. THEORY: Resistance is measured in:
A. Watts
B. Amps
C. Volts
D. Ohms
Answer: D. Correct: Resistance is measured in ohms, the opposition to current flow. Why the other choices are wrong: Amps measure current, Volts measure pressure, and Watts measure power, none of which express resistance. Principle: One ohm allows one ampere to flow under one volt of pressure. Takeaway: Resistance is measured in ohms.
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202 questions for this exam, in Live Test, Study Mode, Flashcards, and MyTutor, a personal AI style tutor that teaches one concept at a time.
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