Power Flashcards
What is power
The rate of energy transfer
What are the units of power
Watts
Kilowatts
What is the equation for power
Power=Energy transfered÷Time taken
How does a house maintain its temperature
Energy is transferred to heat it at the same rate it loses it
What does the cost of electricity depend on
Cost of electricity,
Power of appliance,
Time an appliance is used for
What is energy measured in
Joules
How can we reduce our energy bills
Use low power appliances and use them for less time
How does insulating reduce heating bills
It reduces the amount of heat transferred to the surroundings
What is meant by work done
Transferring energy by using a force over a distance
What is a lever
A simple machine that multiplies the force
Give an example of a lever
Screwdriver opening a tin of paint
Pedal on a bike
How can you increase the work done by a lever
Increase the force or distance the force acts from the pivot
