The Cost of Electricity Flashcards
1
Q
What do electrical appliances do?
A
Transfer electrical energy into other forms
2
Q
What is the equation for energy (using power)? Units
A
E = P * t
Energy = Power * time
J = W * s
or kWh = kW * hour
3
Q
What is the standard unit for energy?
A
kWh
4
Q
When would you use kW rather than W?
A
When you have a large amount of energy eg, how much is used in a home in a week
5
Q
What are the 2 Formulas needed for calculating the cost of electricity?
A
1) No. of units (kWh) used = Power (kW) * Time (hours)
2) Cost = No. of units * Price per Unit
6
Q
Do you have to have a integer value of units when working out cost?
A
No!!
7
Q
What should you check when reading electricity meters?
A
The units.
kWh?
