Ohm's Law MCQ Study Materials - Set 02 - ObjectiveBooks

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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