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Efficiency equation relating to energy
Useful output energy transferred by the device
Total input energy supplied to the device
Efficiency equation relating to power
Useful power out
Total power in
Work done (J) (energy) equation
force applied (N) x distance moved (m)
Change in objects gravitational potential energy (J) store equation
mass (kg) x gravitational field strength (N/kg) x change of height (m)
Change in elastic potential energy (J) equation
½ x spring constant (N/m) x extension2 (m)
Kinetic energy (J) equation
½ x mass (kg) x speed2 (m/s)
power equation
Energy transferred to appliance (J)
Time taken for energy to be transferred (s)
(elephants play tennis)
Power wasted by an appliance equation
total power input - useful power input
Note 
Flashcard (102)