P1.3 Flashcards
1
Q
What is the equation for working out energy transferred from the mains?
A
E= P x t
Energy transferred= Power x time
2
Q
If power is measured in kilowatts and time is measured in hours, how is energy transferred measured?
A
Kilo-watt hours (kWh)
3
Q
If power is measured in watts and time is measured in seconds, what is energy measured in?
A
Joules (J)
4
Q
What does the amount of energy the appliance transfers depend on?
A
How long the appliance is switched on for
The power of the appliance
5
Q
Which device measures the units of electricity used in a building?
A
An electricity meter
6
Q
How is cost of electricity calculated in a building?
A
Cost= number of units × cost per unit
