3.2 Generating Electricity

Efficiency is how well a device _________ one type of energy to another.

If a car converts 5000J of chemical energy into 750J of kinetic, 1250J of heat and 3000J of sound, what % efficient is it?

Mathematical Equivalence

ON

Calculate the % efficiency of this lightbulb.

Mathematical Equivalence

ON

Select the 3 fossil fuels.

• Oil

• Nuclear

• Gas

• Geothermal

• Coal

Organize these options into the right categories.

Groups:

(a) Renewable

,

(b) Non-renewable

• Solar

• Wave

• Gas

• Hydroelectric

• Coal

• Geothermal

• Biomass

• Oil

• Wind

• Nuclear

• Tidal

Wind

Groups:

(a) Advantages

,

(b) Disadvantages

• Unreliable

• No emissions

• Turbines sometimes considered eyesores

• Renewable

• Noise pollution

• No fuel costs

Nuclear

Groups:

(a) Advantages

,

(b) Disadvantages

• No emissions

• Releases lots of energy

• Non-renewable

• Risk of disaster

• Nuclear waste

• Safe

• High decomissioning cost

Select ALL the advantages of renewable energy.

• Generally unreliable

• Can be reused/replaced

• No greenhouse gas emissions

• Unsafe

• Won't run out

Put the parts of a fossil fuel power station in order.

• Fuel is burnt in the furnace

• Water is heated into steam in the boiler

• Steam is cooled back into water in the condenser

• The turbine turns the generator to produce electricity

• Steam turns the turbine

In the furnace of a fossil fuel power station, ​ (a)   energy is transferred to ​ (b)   energy.

• chemical
• heat
• sound
• light
• nuclear
• electrical