An electric lamp of resistance 20 Ω, and a conductor of 4 Ω resistance are connected in series in an electric circuit. What will be the resultant resistance of the circuit?
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A.
1.25 Ω
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B.
0.8 Ω
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C.
8 Ω
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D.
24 Ω
Correct Answer:
D. 24 Ω
Explanation:
When two components, such as an electric lamp and a conductor, are connected in series, the total or equivalent resistance of the circuit is the sum of their individual resistances. This is calculated using the formula R = R1 + R2. Given the lamp has a resistance of 20 Ω and the conductor has a resistance of 4 Ω, the resultant resistance is 20 Ω + 4 Ω = 24 Ω. Therefore, the correct option is D.
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