Physics GCSE - Energy Quiz

?
  • Created by: ShelleyK
  • Created on: 08-04-13 12:51
What does 'conservation of energy' mean?
That energy cannot be created or destroyed, it can only be transferred.
1 of 15
What is 'useful' energy?
Energy that is transferred to where it is wanted , in the form that is is needed.
2 of 15
What is 'wasted' energy?
Energy that is not usefully transferred, but lost to the surroundings.
3 of 15
What is energy measured in?
Joules (J)
4 of 15
What does a Sankey Diagram show?
It shows an energy transfer where energy is wasted
5 of 15
How do you work out the efficiency of a device?
Efficiency = (useful energy transferred by the device ÷ total energy supplied to the device) × 100%
6 of 15
Complete the sentence: Power is...
...the energy transferred per second (usually to an electric appliance)
7 of 15
Complete the sentence: The more powerful an appliance...
...the faster the rate at which it transfers energy
8 of 15
What is power measured in?
watts (W) or kilowatts (kW)
9 of 15
What is 1 watt?
A rate of transfer of energy of 1 joule per second (J/s)
10 of 15
How many watts are equal to 1 kilowatt?
1000 watts
11 of 15
How do we calculate the power of an appliance?
P= E ÷ t - (E is the energy transferred to the appliance in joules (J) and t is the time taken for the energy to be transferred in seconds (s))
12 of 15
What is a kilowatt-hour (kWh)?
the energy supplied to a 1 kW appliance in 1 hour
13 of 15
How do you work out the energy used by a mains appliance?
E = P × t (E is the energy transferred in kilowatt-hours (kWh), P is the power in kilowatts (kW) and t is the time taken for the energy to be transferred in hours (h))
14 of 15
How is the cost of mains electricity worked out?
total cost = number of kWh used ×cost per kWh
15 of 15

Other cards in this set

Card 2

Front

What is 'useful' energy?

Back

Energy that is transferred to where it is wanted , in the form that is is needed.

Card 3

Front

What is 'wasted' energy?

Back

Preview of the front of card 3

Card 4

Front

What is energy measured in?

Back

Preview of the front of card 4

Card 5

Front

What does a Sankey Diagram show?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Energy resources »