Topic 1: Energy Flashcards
1
Q
What is the unit of Power?
A
Watts (W)
2
Q
What is the unit of Energy?
A
Joules (J)
3
Q
What is the unit of Time?
A
Second (s)
4
Q
How do you calculate cost?
A
kWh x tariff
5
Q
How do you calculate efficiency?
A
100 x Total useful energy output / Total Energy Output
6
Q
What are examples of energy sources?
A
Coal, Wind Energy, Uranium, Petroleum, Hydropower, Solar, Geothermal, Hydrogen, Electricity, Natural Gas and Biomass
7
Q
What is the specific heat capacity?
A
Amount of energy required to raise the temp. of 1g of a substance by 1K. The units are in J/kg°c
8
Q
What is the formula for specific heat capacity?
A
E=mc△t
Energy = mass x specific heat capacity x change in temp.
