Tranformers are used in the National Grid to...

increases or decrease the potential difference

increase or decrease the current

convert the energy to electrical energy

speed up the electrons in the circuit

Alternating current is used because...

it can be easily changed and therefore is suitable for long distance travel

it remains constant and is therefore suitable for long distance travel

it uses less energy than direct current and therefore less overall energy is used

it doesn't degrade the wires and therefore they last longer

Which one is a Live Wire?

Brown. Provides the alternating potential difference

Blue. Completes the circuit and carries away current

Green and Yellow. Only carries current when there is a fault

Which one is a Neutral Wire?

Blue. Completes the circuit and carries away current

Brown. Provides the alternating potential difference

Green and Yellow. Only carries current when there is a fault

Which one is an Earth Wire?

Green and Yellow. Only carries current when there is a fault

Brown. Provides the alternating potential difference

Blue. Completes the circuit and carries away current

What is another Equation for Power?

Power = Potential Difference x Current

Power = Potential Difference / Current

Power = Current / Potential Difference

What are the Equations for Energy Transferred?

Energy Transferred = Power x Time

Energy Transferred = Charge Flow x Potential Difference

Energy Transferred = Power / Time

Energy Transferred = Charge Flow / Potential Difference

Sally is creating a model to show what happens when electricity is used. She decided to show the motor spinning below as her model. How could she best explain what is happening?

Electric energy is transformed into energy of motion.

Heat energy is transformed into energy of motion.

Heat energy is transformed into electric energy.

Electric energy is transformed into light energy.

Lightning is a form of static electricity. What can you infer about what happens when lightning strikes the ground?

. Electrons are transferred from the clouds to the ground

Protons and neutrons are transferred from the clouds to the ground

The ground becomes negatively charged

An electric current is established between the clouds and the ground

Which of the following is unsafe?

Using multiple extension cords on one outlet

Using a surge protector when you have a lot of devices to plug into one outlet.

Replacing a blown fuse with a fuse that has the same current

Resetting a breaker box after a circuit breaker trips

GCSE Mains Electricity

Authored by Neil Stewart

Physics

9th - 10th Grade

28 Questions

NGSS covered

Used 130+ times

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Content View

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the voltage of mains electricity in the UK National Grid?

120 V

220 V

230 V

None of these

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the frequency of alternating current in the UK National Grid?

60 Hz

50 Hz

230 V

120 V

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

the type of current that is used in mains electricity

appealing current

diverting current

alternating current

direct current

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

measure of power

watt

ohm

volt

amp

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A circuit that is connected to Earth is said to be _____.

series

parallel

grounded

discharged

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is the power of a 20V bulb with 5A through it?

100W

100V

6.3W

6.3A

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the current through a 11V bulb with a power of 99W?

60V

60A

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GCSE Mains Electricity

What is the voltage of mains electricity in the UK National Grid?

What is the frequency of alternating current in the UK National Grid?

the type of current that is used in mains electricity

measure of power

A circuit that is connected to Earth is said to be _____.

What is the power of a 20V bulb with 5A through it?

What is the current through a 11V bulb with a power of 99W?

A _________ is a plug or cartridge containing a strip of metal that melts when more than a specified amount of current passes through it.

Which wire is connected to a fuse in a UK plug?

What material are the pins made from in a UK plug?

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