Answer to Question #65694 in Electric Circuits for Helen

Question #65694
In the old days, folks who went camping used “lantern batteries.”1 Some people still do, although there is less need now with efficient LED lights. A lantern battery has an emf of 6.00 V and the bulb in the lantern has a resistance of 20.0 Ω. If the current in this bulb is 290 mA, what is the internal resistance of the battery? Assume that the lantern consists solely of the battery and the bulb.
1
Expert's answer
2017-03-03T15:05:05-0500
According to the Ohm’s Law:
I=E/(R+r)
r=E/I-R=(6 V)/(0.29 A)-20 Ω=0.69 Ω

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