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Practice Test: Question Set - 02

1. What is the voltage source for a circuit carrying 2 A of current through a 36 Ω resistor?
    (A) 1.8 V
    (B) 18 V
    (C) 7.2 V
    (D) 72 V

2. If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is
    (A) 220 kΩ
    (B) 22 kΩ
    (C) 2.2 kΩ
    (D) 220 Ω

3. A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.
    (A) 40 Ω
    (B) 4 Ω
    (C) 2 Ω
    (D) 20 Ω

4. Ohm's law describes how current is related to voltage and resistance.
    (A) True
    (B) False

5. How much resistance is needed to draw 17.6 mA from a 12 volt source?
    (A) 212 Ω
    (B) 6.8 kΩ
    (C) 68 Ω
    (D) 680 Ω

6. How much voltage is needed to produce 2.5 A of current through a 200 Ω resistor?
    (A) 50 V
    (B) 500 V
    (C) 80 V
    (D) 8 V

7. The formula for finding voltage when resistance and current are known is V = I/R.
    (A) True
    (B) False

8. The formula to find I when the values of V and R are known is
    (A) I = VR
    (B) I = R/V
    (C) V = IR
    (D) I = V/R

9. The ampere is the unit of resistance.
    (A) True
    (B) False

10. An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately
    (A) 385 Ω
    (B) 38.5 Ω
    (C) 3.1 Ω
    (D) 31 Ω

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