Answers to the following
questions are to be found in the reading assigned (pp. 43 to 46; pp. 48
to 54, starting with "How transformers work . . .")
- Is the usual black, red, white wiring used in homes an example of two-phase alternating current? Yes or No
- What is the formula for power (Watts) in a DC circuit?
- What is the formula for volt-amperes in a single-phase circuit?
- What is the formula for volt-amperes in a three-phase circuit?
- What does kVA stand for?
- What does kW stand for?
- In a single-phase AC circuit, a wattmeter reads 500 W. A
voltmeter and an ammeter are connected at the same place that the
wattmeter is connected. The voltmeter reads 120 V., and the ammeter
reads 4.17 amps. What is the power factor?
- Same as the previous problem, except that the ammeter reads 5 amps. What is the power factor?
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