The performance of a solar cell is measured in terms of its efficiency at turning ____ into electricity.
a. wind
b. rain
c. sunlight
d. moonlight
c. sunlight
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Answer the following statement(s) true (T) or false (F)
1. If two phases of the supply to a three-phase induction motor are interchanged, the motor will stop. 2. The sensing network continuously monitors the motor line currents. 3. A built-in delay of five cycles prevents nuisance dropouts caused by fluctuating line voltages. 4. Motor protector modules feature phase forward. 5. Motor protector modules feature instantaneous fault protection.
Answer the following statement(s) true (T) or false (F)
1. The power in an AC circuit is equal to the product of voltage and current.
2. In the accompanying figure, the graph shows the voltage, current, and power values for an AC resistive circuit.
3. In an AC inductive circuit containing resistance, at 90° of current lag, the net power is zero.
4. Power in all circuits is a function of voltage, current, and power factor:
A bolt of lightning generates broad radio frequency bandwidths known as ________
A) Frequency Modulation (FM)
B) Electromagnetic Interference (EMI)
C) Radio Frequency Interference (RFI)
D) Both B and C
A pressure of 1 bar is approximately equal to:
A) 1000 kilopascals. B) 14.7 psig. C) Atmospheric pressure. D) The pressure exerted by a 1 kilogram bar over a 1 square meter surface.