Electric heater - energy heating the surroundings (useful). light emitted from the glowing element (waste).
Back
Card 27
Front
P1.8 - Electical appliances (2)
Back
Card 28
Front
Hairdryer - kinetic energy of air driven by fan (useful). sound of fan motor (waste). energy heating air flowing past heater filament (useful). energy heating hairdryer (waste)
Back
Card 29
Front
P1.8 - Electical appliances (3)
Back
Card 30
Front
Electrical appliances can transfer energy in the form of useful energy at the flick of a switch.
Back
Card 31
Front
An electrical appliance is designed for a particular purpose and should waste as little energy possible.
Back
Card 32
Front
The more powerful an appliance is, the faster the rate at which it transfers energy.
Back
Card 33
Front
power, P (W) = energy transferred to appliance, E (J) / time taken for energy to be transferred, t (s)
