Grade 9: Electricity Revision 2

The following statements about a circuit overload are true except ______:

• Too much current can cause overheating and possibly a fire

• The current in the circuit is linked to the power rating of the appliance

• Too many appliances on one circuit will overload the circuit

• Overloading happens when 1 or 2 appliances are being used at a time.

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Choose the correct phrase to complete the following sentence: Earthing is_________

• Current running through an unintended path

• Instantaneous discharge directly to the earth

• A thin wire that will melt and break the circuit when overloaded

• A flow of electrons through the neutral wire

The purpose of a 3-point plug is to:

• Draw a greater current to operate appliances.

• Make it easier to plug in.

• It has an earth wire as a safety protector

• Provide a closed circuit by connecting the live and neutral wires

A thin wire that will melt and break the circuit when overloaded is called a:

• Trip switch

• Fuse

• Earth leakage

• rheostat

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In a three point plug _____

• The green and yellow wire complete the circuit for the flow of current

• The blue and brown wires need to be connected to each other in order to conduct the current

• The green and yellow wire connects to the metal casing of an appliance for safety

• The blue wire is live and the brown is neutral

An example of a renewable energy source is

• Uranium

• Wind

• Coal

• Natural Gas

An example of a non-renewable energy resource is:

• Wind

• Crude oil

• Waves

• The sun

The following are all examples of fossil fuels, except:

• Crude oil

• Uranium

• Natural Gas

• Coal

Hydroelectric power can be provided by all of the following except:

• A thunderstorm

• Waves

• Dams

• Falling water

Two hydrogen atoms merging to form a helium atom and large amounts of energy is an example of:

• A non-renewable power sorce

• Nuclear fission

• Nuclear fusion

• Hydrogen power

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