1a. Many electrical plugs & outlets are \"polarized\", where one of the two conn

Question

1a. Many electrical plugs & outlets are "polarized", where one of the two connecters is larger than the other one. What statement below best describes these two connectors?

A) The smaller one is the ground wire that is there as a safety feature in case there is faulty wiring in the device; the larger one is hot (120 V)
B) The larger one is the neutral one (at ground - i.e., 0 V), the smaller one is the hot one (at 120 V)
C) The larger one is the ground wire that is there as a safety feature in case there is faulty wiring in the device; the smaller one is hot (120 V)
D) The larger one is the hot one (at 120 V), the smaller one is neutral (at ground - i.e., 0 V)
E) Both wires are identical - the size difference is just there to make sure you don't plug it in upside-down.

1b. A circuit breaker trips when:

A) There is too much current passing through the circuit breaker because too many R's are in parallel
B) There is too much voltage across the circuit breaker because too many R's are in series
C) There is too much voltage across the circuit breaker because too many R's are in parallel
D) There is too much resistance in the circuit since too many R's are in series.
E) There is too much current passing through the circuit breaker because too many R's are in series

1c. If you run a 500 W computer for 4 hours, your electric meter will read ____; this is a measure of _______ "used"

A) 2000 kWh, energy
B) 2 kWh, voltage
C) 2000 kWh, power
D) 2 kWh, energy
E) 2 kWh, current
F) 2 kWh, power
G) 2000 kWh, voltage
H) 2000 kWh, current

1d. The power formula for AC circuits (for resistors) is the same as for DC circuits:

A) under no circumstances since they are different kinds of electricity.
B) if we use the rms voltage and/or current.
C) whether we use the peak or rms voltage and/or current.
D) if we use the peak voltage and/or current.

Explanation / Answer

1) C

2) A

3)D

4) B

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