Ohm's Law MCQ Theory Practice Test - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. If you wish to increase the amount of current in a resistor from 120 mA to 160 mA by changing the 24 V source, what should the new voltage setting be?
(A) 8 V
(B) 320 V
(C) 3.2 V
(D) 32 V

2. When 12 V are applied across a 68 Ω resistor, the current is
(A) 816 mA
(B) 17.6 mA
(C) 176 mA
(D) 8.16 mA

3. What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA?
(A) 8.2 kΩ
(B) 820 Ω
(C) 8.2 Ω
(D) 82 Ω

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

5. Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?
(A) 4 Ω
(B) 400 Ω
(C) 4 kΩ
(D) 4.4 Ω

6. How much current is produced by a voltage of 18 kV across a 15 kΩ resistance?
(A) 1.2 A
(B) 12 A
(C) 120 mA
(D) 12 mA

7. A resistance of 3.3 MΩ is connected across a 500 V source. The resulting current is approximately
(A) 15.1 µA
(B) 151 µA
(C) 66 mA
(D) 660 mA

8. Approximately how many milli-amperes of current flow through a circuit with a 40 V source and 6.8 kΩ of resistance?
(A) 27.2 mA
(B) 59 mA
(C) 5.9 mA
(D) 590 mA

9. If 750 µA is flowing through 11 kΩ of resistance, what is the voltage drop across the resistor?
(A) 8.25 V
(B) 82.5 V
(C) 14.6 V
(D) 146 V

10. When there is 12 mA of current through a 1.2 kΩ resistor, the voltage across the resistor is
(A) 14.4 V
(B) 1.4 V
(C) 100 V
(D) 10 V

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