Ohms Law MCQ Questions & Answers | Electrical Engineering

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Current Affairs Interview Blog

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

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Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

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

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Answer & Solution

Answer: Option C

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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

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Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Ohm's law describes how current is related to voltage and resistance.

A) True B) False

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Answer & Solution

Answer: Option A

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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

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Answer & Solution

Answer: Option A

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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

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Answer & Solution

Answer: Option D

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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

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Answer & Solution

Answer: Option A

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The formula to find $${\text{I}}$$ when the values of V and R are known is

A) $${\text{I}} = {\text{VR}}$$ B) $${\text{I}} = \frac{{\text{R}}}{{\text{V}}}$$ C) $${\text{V}} = {\text{IR}}$$ D) $${\text{I}} = \frac{{\text{V}}}{{\text{R}}}$$

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Answer & Solution

Answer: Option D

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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

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Answer & Solution

Answer: Option A

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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

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Answer & Solution

Answer: Option D

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