Which is correct in reference to electrical resistance?

Question

BlackTom AI · Accepted Answer

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?

查看解析

登录即可查看完整答案

类似问题

Which is correct concerning a parallel circuit?

Which is correct concerning a parallel circuit?

Which statement is correct when made in reference to a parallel circuit?

The lamps in a string of decorative lights are connected in parallel across a constant-voltage power source. What happens if one lamp burns out? (Assume negligible resistance in the wires leading to the lamps.)

When unequal resistors are connected in parallel in a circuit,

In the circuit below, i = 4.0 Amps, R1 = 5.8Ω and R2 = 3.5Ω. Find Vs in Volts to 2dp.

I have a simple circuit running off a battery powering a lightbulb (bulb A). If I add another light (bulb B) parallel to bulb A I can expect that the voltage across bulb A will _________ and bulb A will shine___________.

If I add a completely parallel branch to an existing circuit then the equivalent (or total) resistance of the circuit will..

更多留学生实用工具

希望你的学习变得更简单

I have a simple circuit running off a battery powering a lightbulb (bulb A). If I add another light (bulb B) parallel to bulb A I can expect that the voltage across bulb A will _ and bulb A will shine___.