Electrical Appliances Flashcards
1
Q
What does the amount of electrical energy transferred to an appliance depend on?
A
Its power and the length of time it is switched on.
2
Q
E= P x t
A
E = Energy transferred in kilowatt-hours(kWh) P= Power in kilowatts(kW) t= Time in hours(h)
3
Q
How do we convert W to kW?
A
Divide by 1000
4
Q
How do we convert S to H?
A
Divide by 3600
5
Q
What do electricity meters measure?
A
The number of units of electricity used in a building
6
Q
How do we calculate the cost of electricity?
A
Total cost = number of units x cost per unit
7
Q
Equation for payback time:
A
Payback time = cost of energy saving measure/ money saved each year
