Chapter 1.9 Energy and power Flashcards
1
Q
What is power the rate of?
A
Power is the rate of transfer of energy.
2
Q
What is the equation for power?
A
Power(Watts, W) = Energy transferred to appliance(joules,J) /time taken for energy to be transferred, t(seconds,S)
3
Q
What is the equation of the efficiency of a appliance?
A
Efficiency of an appliance
= useful power out /total power in (x100%)
4
Q
What is the equation for power wasted by an appliance?
A
Power wasted by an appliance = total power input - useful power output
5
Q
What is the equation of efficiency?
A
Efficiency= useful energy transferred by the device /total energy supplied to it (X100%)
