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What is the power of a CD player if it uses 60000 joules for 30 minutes assuming 100 percent efficiency?
Wiki User
∙ 11y ago
Power = energy used/time to use it
Power of this CD player = 60,000/(30 x 60) = 331/3 watts
That solution doesn't depend on the player's efficiency ... you specified
only the energy it uses.
But since you did mention the concept of efficiency, I'm compelled to add a
thought here: If you're describing the kind of CD player that you can carry
in your pocket and listen to it on the bus, then 33 watts is an astronomical
power consumption for it. You'd need to carry a back-pack full of batteries,
and recharge them every few hours.
If these are real figures, and the thing really does consume 33 watts in normal
use, then I hope it plugs into the wall, and drives a nice pair of speakers.
Wiki User
∙ 11y ago
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.33
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25 percent
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The efficiency is 80%. To find the efficiency, 400/500 = 80%.
What is the mechanical efficiency of a machine that produce 400 joules of work output from a work input of 500 joules?
The efficiency is 80%. To find the efficiency, 400/500 = 80%.
Find the efficiency of a machine that does 800 joules of work if the input work is 2400 joules?
.33
How Efficiency is measured in joules?
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