A battery is rated at 140 ampheres-hours which means that it can supply 1amphere for 140hours or two ampheres for 70hours etc.
A light bulb connected to the battery with 12.1MJ of electrical energy stored and an output power of 240W uses up all its electrical energy in 14hours.
calculate the resistance of the light bulb...
The answer given is 2.4ohms..
how do i solve this?help me pls ty..
A battery is rated at 140 ampheres-hours which means that it can supply 1amphere for 140hours or two ampheres for 70hours etc.
A light bulb connected to the battery with 12.1MJ of electrical energy stored and an output power of 240W uses up all its electrical energy in 14hours.
140 / 14 = 10 amperes in 14 hours
So, since P = I^2 * R, 240 = 10^2 * R
R = 2.4 ohms
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Eagle
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