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Efficiency Questions? AQA Science??? Please Help Ten points available.?
Well, All I know is that...
The effiency of a device = The useful energy radiated by a device ÷ the total energy supplied to the device
Now here's the tricky stuff...
A Manufacture Claims A Drill Motor Has an Efficiency of 0.35. The drill motor is supplied with 3000 Joules of electrical energy when the hole is drilled. Calculate:
1) The Useful Energy from the drill motor
2) The energy wasted by the drill.
Now, the second question.
A torch lamp has 20 Joules of Useful Energy, And The Effeciency of it is 0.40.
Find out The amount of Energy Supplied in Joules, and the energy wasted in joules.
Thankyou Very Much
Hannah..X
Shouldn't that be 2 questions and worth 20 points? 
1) Useful energy = efficiency * total energy = 0.35 * 3000 = 1050 Joules
2) energy wasted = total energy - useful energy = 3000 - 1050 = 1950 Joules
Torch lamps :
Total energy supplied = useful energy / efficiency = 20 / 0.4 = 50
energy wasted = total energy - useful energy = 50 - 20 = 30
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