Which is correct in reference to electrical resistance?

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Question: Which is correct in reference to electrical resistance?

Option: If one of three bulbs in a parallel lighting circuit is removed, the total resistance of the circuit will become greater.

Analysis: In a parallel circuit, each bulb provides an independent path for current. The total or equivalent resistance in parallel is found using 1/R_total = 1/R1 + 1/R2 + 1/R3. If all three bulbs have the same resistance R, then 1/R_total = 1/R + 1/R + 1/R = 3/R, so R_total = R/3. When one bulb (one branch) is removed, only two paths remain, giving 1/R_total_new = 1/R + 1/R = 2/R, so R_total_new = R/2. Since R/2 is greater than R/3, the total resistance indeed increases when a branch is removed. This matches the statement.

Additional note on potential confusion: Some might think removing a load increases resistance in series, or that removing a branch in parallel could decrease resistance. However, the defining property of parallel circuits is that adding parallel branches lowers the total resistance (more paths for current). Conversely, removing a branch reduces the number of paths, raising the total resistance.

Conclusion derived from concept: In a parallel circuit with identical resistors, removing one branch increases the equivalent resistance because there are fewer parallel pathways for current to flow.

AMT&101 36393 Test - Basic Electricity

Which is correct in reference to electrical resistance?

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AMT&101 36393 Test - Basic Electricity

Which is correct in reference to electrical resistance?

View Explanation

Log in for full answers

Similar Questions

Which is correct concerning a parallel circuit?

Which is correct concerning a parallel circuit?

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More Practical Tools for Students Powered by AI Study Helper

Making Your Study Simpler

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