First slide

Electrical power

Question

In the circuit diagram, all the bulbs are identical. Which bulb will be the brightest?

Moderate

A

A
B

B
C

C
D

D

Solution

As all bulbs are identical and the power (related to brightness) is given as P = I² R, so the resistor with the most current will be brightest. As bulb C has the same current as that through the battery while the branches with bulbs A, B and D are in parallel and have the total current split between the branches, the current through bulb C is greatest.

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