How long does one complete cycle of a 60 Hz waveform take?
Answer in ms.
Show the answer
16.67 ms
Period T = 1 ÷ f = 1 ÷ 60 = 0.01667 s. 0.01667 s × 1,000 = 16.67 ms.
Reference: AC fundamentals: period T = 1 ÷ f
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Electrical Levels 1 to 4 module tests practice test
170 free practice questions for this exam, each with the reason for the answer and where to look it up.
Electrical theory and calculations: practice test
10 questions, graded as you go, with the reason for every answer. No sign-up.
Practice tests that prepare you for this exam
About the exam
| Exam | Electrical Levels 1 to 4 module tests |
|---|---|
| Who runs it | NCCER |
| Where | United States |
Question count, time limit and pass mark differ by where you take it. Check the official candidate bulletin from the organisation that runs your exam.
Sample questions
A motor delivers 10 hp at its shaft. What is its output power in watts? (1 hp = 746 W)
Answer in W.
Show the answer
7460 W
Output = hp × 746 = 10 × 746 = 7,460 W.
Reference: Unit conversion: 1 hp = 746 W
A heating element with a resistance of 24 Ω is connected to a 120 V source. How much current does it draw?
Answer in A.
Show the answer
5 A
I = E ÷ R = 120 V ÷ 24 Ω = 5 A.
Reference: Ohm's law, I = E ÷ R
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