Give the formula to find the efficiency of a product?
efficiency=useful energy output/total energy output
1 of 5
What is the only device to be completely 100% efficient?
Electric Heater
2 of 5
A car has 3000J of total energy input. It transfers 2879J to a kinetic energy store. What is the efficency of the car?
95.96%
3 of 5
A hair dryer is 76% efficient. There is 59W useful energy output. Work out the total energy input.
78W to 1dp
4 of 5
A motor transfers 300J into car energy stores. 225J of that energy are transferred to the car's kinetic energy stores. What is the efficiency of the motor?
75
5 of 5
Other cards in this set
Card 2
Front
What is the only device to be completely 100% efficient?
Back
Electric Heater
Card 3
Front
A car has 3000J of total energy input. It transfers 2879J to a kinetic energy store. What is the efficency of the car?
Back
Card 4
Front
A hair dryer is 76% efficient. There is 59W useful energy output. Work out the total energy input.
Back
Card 5
Front
A motor transfers 300J into car energy stores. 225J of that energy are transferred to the car's kinetic energy stores. What is the efficiency of the motor?
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