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Chapter 4: Q11DQ (page 873)

If the battery in Discussion Question Q26.10 is ideal with no internal resistance, what will happen to the brightness of the bulb when S is closed? Why?

Short Answer

Expert verified

There is no change in brightness.

Step by step solution

01

Parallel Connection

When components are parallelly connected in a circuit the potential drop across all the components is the same.

02

Determining the brightness of the bulb

As the internal resistance is zero r = 0, the voltage drop will be

V=ε-IrV=ε

The voltage drop will not change as a result of the internal resistance, according to the equation. The current changes as the total resistance in the circuit changes, but the voltage remains constant. As a result, because the voltage is the same across the bulb, the brightness will be the same.

Hence, there is no change in brightness.

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