Question
When a new 9.0 V battery is connect to a torch, the power emitted by the bulb is 6.0 W. After the battery has run-down
When a new 9.0 V battery is connect to a torch, the power emitted by the bulb is 6.0 W. After the battery has run-down somewhat, the internal resistance of the run-down battery is 7.4 . What is the power emitted by the bulb now? (You should assume that the resistance of the bulb is independent of the current flowing through it.)
Answer is 2.5 W
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Fundamentals of Physics
Authors: Jearl Walker, Halliday Resnick
9th Edition
ISBN: 470469080, 470556536, 470469110, 9780470469088, 9780470556535, 978-0470469118
