# 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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