Most wrong answers are not wrong maths -- they are the right maths applied to a question nobody finished reading.
Under time pressure people recognise a question type, start calculating, and never get to the clause at the end that changes which quantity is being asked for.
A question gives you voltage and resistance and ends by asking for current. You can work out power from the same two numbers, and power is the more satisfying calculation, so that is the one people do. The arithmetic is perfect. The answer is in watts. The question asked for amperes, so it scores zero.
Check yourself: A question hands you volts and ohms and asks for current. What unit does your answer carry?
Answer: Amperes. A question asking for current needs an answer in amperes, not watts.
The quantity asked for decides the unit, and the unit is what marks the answer right or wrong. Calculating something true about the circuit is not the same as answering the question.
No card. No account needed to start. Score by topic against the 70% mark.
Written from the owner's poster for this lesson. Nothing added beyond what the poster states.
Written for Texas apprentices as free study material. The Texas apprentice licence is an application, not an exam (Occupations Code 1305.161), and nothing here counts as apprenticeship hours or continuing-education credit. VoltMark is not affiliated with, endorsed by, or sponsored by NFPA, PSI, TDLR, or any state or local licensing authority. Always follow your employer's safety programme and your supervising electrician.
Electrician licensing exam prep: practice questions, timed exam simulations, and step-by-step help finding every answer in the NEC.