Cost of Electrical Energy Flashcards
1
Q
when calculating the energy transferred by a device in joules, what units are used for power and time
A
watts and seconds
2
Q
if an electricity meter reads 4579 units, then 2 months later reads 4609 how may kilowatt hours of energy have been used
A
30 kilowatt hours
3
Q
3 factors affecting the cost of running an electrical device
A
- power of the device
- amount of time device is on for
- cost per unit of electricity
4
Q
how much energy in kilowatt hours does a 3000W heater transfer in 3 hours
A
3x3= 9kWh
5
Q
when calculating the amount of energy transferred by a device in kilowatt hours, which units for power and time are used
A
kilowatts and hours
