Dc Theory Level 2 Lesson 5
Question: Power delivered to a DC circuit is the measure of the amount of ? the circuit per unit of time.
current flow
horsepower
voltage drop in
work done by
Answer: d. work done by
Question: When reviewing the power consumed by the circuit, what are the two possible ways in which the power is consumed?
Answer: b. Heat / useful work
Question: The sum of the power dissipated by each resistor in a series circuit is equal to the ? .
Select one:
total current in the series branch
b. total power
c. total resistance
d. voltage times the resistance
Answer: b. total power
Question: Decreasing the voltage applied to a standard wattage lamp below that recommended by the manufacturer would result in a decrease in the amount of power consumed by the lamp.
Select one:
True
False
Answer: True
Question: What would happen to a resistor if it was subjected to voltages or currents which caused it to dissipate more power than the value for which it was rated?
Select one:
a. The resistance value would increase.
b. The resistance value would decrease.
c. It would be damaged.
d. None of the above.
Answer: c. It would be damaged.
Question: Which formula would be used to find the maximum current that can be carried by a resistor if the resistor’s resistance and wattage rating are known?
Select one:
a. I = RxP
b. I = P / R
c. I = square root R / P
d.I = square root P / R
Answer: d.
Question: The total power requirement in a series circuit is the sum of the powers of the individual components in that circuit.
Select one:
True
False
Answer: True
Question: As the current through a series circuit increases, the total power dissipated in each component decreases.
Select one:
True
False
Answer: False
Question: Which is the formula used to determine the total power in a series circuit, when the total resistance and current of that circuit are known?
Select one:
a. Pt = Rt x Et
b. Put = It x Rt squared
c. Pt = square root of Rt / It
d. Pt = It squared x Rt
Answer: d.
Question: If the current through a resistor is reduced by one-half, the power being dissipated by the resistor will be ? of the original power.
Select one:
a. 1/8
b. 1/4
c. 1/2
d. 3/4
Answer: b. 1/4