Ohm's Law Objective Exam Questions

Practice Test: Question Set - 03


1. A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange and silver?
    (A) 2 mA
    (B) 2.2 mA
    (C) 214 mA
    (D) 21.4 mA

2. How much resistance is required to limit the current from a 12 V battery to 3.6 mA?
    (A) 3.3 kΩ
    (B) 33 kΩ
    (C) 2.2 kΩ
    (D) 22 kΩ

3. What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?
    (A) 9.7 Ω
    (B) 97 Ω
    (C) 23 Ω
    (D) 230 Ω

4. You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?
    (A) 9 V
    (B) 900 mV
    (C) 0 V
    (D) 18 V

5. The current through a flashlight bulb is 40 mA and the total battery voltage is 4.5 V. The resistance of the bulb is approximately
    (A) 112 Ω
    (B) 11.2 Ω
    (C) 1.2 Ω
    (D) 18 Ω

6. A current of 200 µA through a 6.8 kΩ resistor produces a voltage drop of
    (A) 34.4 V
    (B) 340 V
    (C) 13.6 V
    (D) 1.36 V

7. According to Ohm’s Law
    (A) V is directly proportional to I
    (B) V is inversely proportional to I
    (C) V is directly proportional to √I
    (D) All o the above

8. Four amperes of current are measured through a 24 Ω resistor connected across a voltage source. How much voltage does the source produce?
    (A) 960 V
    (B) 9.6 V
    (C) 96 V
    (D) 8 V

9. Approximately how much current flows through a 3.3 MΩ resistor across a 30 V source?
    (A) 9 μA
    (B) 90 μA
    (C) 900 μA
    (D) 9000 μA

10. What is the approximate filament resistance of a light bulb if it operates from a 110 V source and 0.6 A of current is flowing?
    (A) 183 Ω
    (B) 18.3 Ω
    (C) 66 Ω
    (D) 6.6 Ω

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Item Reviewed: Ohm's Law Objective Exam Questions Rating: 5 Reviewed By: Pranab Debnath
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