# Practice Test: Question Set - 02

1. A half-watt is equal to how many milliwatts?
(A) 5,000 mW
(B) 5 mW
(C) 500 mW
(D) 50 mW

2. A 75 Î© load uses 2 W of power. The output voltage of the power supply is approximately
(A) 120 V
(B) 1.2 V
(C) 12 V
(D) 6 V

3. A resistor normally opens when it burns out.
(A) True
(B) False

4. The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be
(A) 2 W
(B) 1 W
(C) 5 W
(D) 0.5 W

5. The capacity of a battery is measured in milli-amperes.
(A) True
(B) False

6. A 33 Î© half-watt resistor and a 330 Î© half-watt resistor are connected across a 12 V source. Which one(s) will overheat?
(C) Both resistors
(D) Neither resistor

7. A given power supply is capable of providing 6 A for 3.5 h. Its ampere-hour rating is
(A) 0.58 Ah
(B) 2.1 Ah
(C) 21 Ah
(D) 58 Ah

8. A battery is one type of power supply that converts chemical energy into electrical energy.
(A) True
(B) False

9. If it takes 400 ms to use 12,000 J of energy, the power is
(A) 30 kW
(B) 30 W
(C) 3 W
(D) 300 kW

10. Three hundred joules of energy are consumed in 15 s. The power is
(A) 2,000 W
(B) 2 W
(C) 20 W
(D) 200 W

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