1.) What\'s the minimum threshold for often fatal heart fibrillation due to elec
ID: 1440235 • Letter: 1
Question
1.) What's the minimum threshold for often fatal heart fibrillation due to electricity?
A) 15 mc (AC), 60 mA (DC)
B) 120 Volts (AC), 240 Volts (DC)
C) 310 Ohms (AC), 290 Ohms (DC)
D) 310 Ohms (AC or DC)
E) 120 Volts (DC), 240 Volts (AC)
F) 100 mA (AC), 500 mA (DC)
2) 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) Both wires are identical - the size difference is just there to make sure you don't plug it in upside-down.
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 neutral one (at ground - i.e., 0 V), the smaller one is the hot one (at 120 V)
E) The larger one is the hot one (at 120 V), the smaller one is neutral (at ground - i.e., 0 V)
3) A circuit breaker trips when:
A) There is too much current passing through the circuit breaker because too many R's are in series
B) There is too much voltage across the circuit breaker because too many R's are in parallel
C) There is too much resistance in the circuit since too many R's are in series.
D) There is too much current passing through the circuit breaker because too many R's are in parallel
E) There is too much voltage across the circuit breaker because too many R's are in series
4) If you run a 500 W computer for 4 hours, your electric meter will read ____; this is a measure of _______ "used"
A) 2 kWh, current
B) 2000 kWh, power
C) 2000 kWh, energy
D) 2000 kWh, voltage
E) 2000 kWh, current
F) 2 kWh, power
G) 2 kWh, energy
H) 2 kWh, voltage
5) 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) if we use the peak voltage and/or current.
D) whether we use the peak or rms voltage and/or current.
6) If you see an AC device with a voltage and/or current rating, these values are:
A) peak values
B) minimum values
C) average values
D) rms values
Explanation / Answer
1): The correct answer is,
F) 100 mA (AC), 500 mA (DC)
2): The correct answer is,
D) The larger one is the neutral one (at ground - i.e., 0 V), the smaller one is the hot one (at 120 V)
3): The correct answer is,
D) There is too much current passing through the circuit breaker because too many R's are in parallel
4): The correct answer is,
Energy = Power * time = 500*4 = 2000 WH = 2 KWH
G) 2 kWh, energy
5): The correct answer is,
B) if we use the rms voltage and/or current.
6): The correct answer is,
D) rms values
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