Q25.14 A light bulb glows because it has resistance. The brintess of a light bul
ID: 1436726 • Letter: Q
Question
Q25.14 A light bulb glows because it has resistance. The brintess of a light bulb increases with the electrical power dissipated in the bulb. In a circuit with one battery and two identical bulbs in series, A and B, with bulb B *after* bulb A in the series, does bulb B glow MORE brightly, LESS brightly, or the same? Explain!
b) IF bulb B is now removed from the circuit, so that now the same battery is connected only to bulb A, does this single bulb glow MORE brightly than it did in the first circuit (a), LESS brightly than it did, or the SAME? Explain briefly again!
Explanation / Answer
(A)
The brightness depends on the current flow as the two bulbs are identical. The current flow is same in the series bulbs. As the bulbs are identical, the brightness is same for the two bulbs.
(B)
If the bulb B is removed from the circuit, the effective resistance in the circuit is will be half, and the current flow (I=V/R) will be double as compared to previous case. Therefore, the brightness of the bulb A is more compared to the part (a).
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