A battery consists of an ideal source of potential difference in series with a s

Question

A battery consists of an ideal source of potential difference in series with a small resistance. The electrical energy of the battery is produced by chemical reactions that occur in the battery. However, these reactions also result in a small resistance that, unfortunately, cannot be completely eliminated. A flashlight contains two batteries in series, as shown in the figure below. Each has a potential difference of 1.50 V and an internal resistance of 0.26 . The bulb has a resistance of 28.0 .


(a) What is the current through the bulb?
. A

(b) How much power does the bulb dissipate?
. W

(c) How much greater would the power be if the batteries had no internal resistance?
W

Explanation / Answer

Solution:

a) I = V/ R = 1.5+1.5 / 0.26+0.26+28 = 0.105 Amps

b) P =I2 *R = 0.3098 Watts

c) P = 0.1072 * 28 = 0.3214 Watts

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