1. Many electrical plugs & outlets are \"polarized\", where one of the two conne
ID: 1440444 • Letter: 1
Question
1. 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 larger one is the hot one (at 120 V), the smaller one is neutral (at ground - i.e., 0 V)
B) 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)
C) Both wires are identical - the size difference is just there to make sure you don't plug it in upside-down.
D) 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)
E) The larger one is the neutral one (at ground - i.e., 0 V), the smaller one is the hot one (at 120 V)
I chose B, but the answer is wrong.
2. What's the minimum threshold for often fatal heart fibrillation due to electricity?
A) 120 Volts (AC), 240 Volts (DC)
B) 120 Volts (DC), 240 Volts (AC)
C) 310 Ohms (AC or DC)
D) 100 mA (AC), 500 mA (DC)
E) 310 Ohms (AC), 290 Ohms (DC)
F) 15 mc (AC), 60 mA (DC)
A is wrong.
3. What quantity is most directly dangerous to the human body?
A) high resistance
B) high electric field strength
C) high conductivity
D) high voltage
E) high current
C is wrong.
4. Your car's wiper blades have several settings for the time between when they sweep across your windshield. This timing can be set by an RC circuit. If you were to increase the resistance of the resistor in this circuit, the blades would wipe:
A) less often
B) at the same time interval
C) more often
C is wrong.
5. You measure the current in an RC circuit and observe that it is exponentially decaying. You can conclude that the capacitor must:
A) charging
B) discharging
C) charging or discharging
D) this is not possible
A is wrong. Is it B?
Explanation / Answer
1. C) Both wires are identical - the size difference is just there to make sure you don't plug it in upside-down.
2.D) 100 mA (AC), 500 mA (DC)
3.D) high voltage
4.B) at the same time interval
5.B) discharging
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