S2 Electricity and circuitsRevision Quiz

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Instructions

• You will see a series of questions on the last topic

• Click on the answer you think is correct

• Some pages use underlined answers, some use buttons or pictures

Question 1

• If a substance allows electricity to flow through it, we call it …

An Insulator

A ConductorElectrical

Unlucky!

• Sorry that’s not correct, try again.

• If you want to start again, go back to the start page

Well Done!

• That’s right, if a substance can carry electricity we call it a conductor.

• A substance that can’t carry electricity is called an insulator.

Question 2

• In this series circuit below, if one bulb goes out, the other bulb

Goes OutBlows Gets brighter

Well Done!

• That’s right, in a series circuit, if one component breaks, all the others will go out too.

Question 3

• In a parallel circuit like the one below, if one bulb blows, the others stay on, this is because

The bulbs need less energy to work

There is another path for current to flow

Well Done!

• That’s correct, in a PARALLEL circuit, there is more than one path for the current to flow

• Also, if one component breaks, the rest stay on

Question 4

• If you increase the number of bulbs in a series circuit, the bulbs will

Get dimmerStay the same brightness

Get brighter

Well Done!

• That’s right, in a SERIES circuit, adding more bulbs makes them dimmer

• In a PARALLEL circuit, adding more bulbs has no effect on their brightness

Question 5

• Which meter is used to measure current?

Ammeter Ohm meter

Voltmeter

Well Done!

• That’s right, we use an ammeter to measure current

• Current is measured in amperes or amps (A)

Question 6

• Which Diagram shows the correct way to connect an ammeter?

Well Done!

• Ammeters must be connected in series

• Increasing the current will give a bigger reading on the ammeter and make a bulb brighter

Question 7

• Voltage is the amount of energy carried by the charges round the circuit

• We measure voltage using what?

Voltmeter

ammeter

ohmmeter

Well Done!

• We use a voltmeter to measure voltage

• We connect a voltmeter across a component – in parallel

Question 8

• Current is related to resistance, if you have a high current you will have

Low resistance High resistance

Well Done!

• High current = Low resistance

• Low current = high resistance

What unit is current measured in?What unit is current measured in?

Amps Volts Ohms

Correct! That was an easy Correct! That was an easy one…. Current is measured in one…. Current is measured in Amps with the unit symbol AAmps with the unit symbol A

Click to continueClick to continue

No! Volts is the unit of measure No! Volts is the unit of measure of the voltage! of the voltage!

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Incorrect! Ohms is not a Incorrect! Ohms is not a measure of current… it’s the measure of current… it’s the measure of resistancemeasure of resistance

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The circuit below shows two bulbs in ?The circuit below shows two bulbs in ?

Series Parallel

Correct! Correct!

The bulbs are connected in The bulbs are connected in series with each other.series with each other.

Wrong! The bulbs are Wrong! The bulbs are connected in a single connected in a single continuous circuit… a continuous circuit… a seriesseries circuit! circuit!

In the circuit below which In the circuit below which bulbs will be lit when the bulbs will be lit when the switch is open?switch is open?

Both bulbs Bulb 1 only Neither bulb

No… If the switch is open there No… If the switch is open there is not a complete circuit and so is not a complete circuit and so no current will flow.no current will flow.

Neither bulb will lightNeither bulb will light

Good! If the switch is open there Good! If the switch is open there is no current flowing so neither is no current flowing so neither bulb will light.bulb will light.

Carry on…Carry on…

If the reading on ammeter 1 is 1A what will If the reading on ammeter 1 is 1A what will be the reading on be the reading on ammeterammeter 22 if the bulbs if the bulbs are considered identical?are considered identical?

0A 1A 0.5A

Incorrect! In a series circuit the Incorrect! In a series circuit the current is the same at all pointscurrent is the same at all points

Try again..Try again..

Correct! The current measured at Correct! The current measured at any point will be the same in a any point will be the same in a series circuit.series circuit.

Continue..Continue..

What is the reading on the What is the reading on the voltmetervoltmeter if the bulbs are if the bulbs are identical?identical?

18V 9V4.5V

In a series circuit if the bulbs are In a series circuit if the bulbs are identical the battery voltage will be identical the battery voltage will be divided evenly between them..divided evenly between them..

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Well done! The battery voltage of 9V will Well done! The battery voltage of 9V will be split evenly between the two bulbs.be split evenly between the two bulbs.

Carry on..Carry on..

In the parallel circuit below, with identical In the parallel circuit below, with identical resistors, what will be the reading on the resistors, what will be the reading on the voltmetervoltmeter??

6V 12V 3V

Yes! The voltage across each branch of Yes! The voltage across each branch of the circuit will be equal to the battery the circuit will be equal to the battery voltage.voltage.

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Oops! Remember the voltage across each Oops! Remember the voltage across each branch of a parallel circuit is equal to the branch of a parallel circuit is equal to the battery voltage.battery voltage.

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If all the resistors are identical what will be If all the resistors are identical what will be the reading on the the reading on the ammeterammeter??

3A 9A 1A

For the same circuit what will be the For the same circuit what will be the reading on the reading on the voltmetervoltmeter??

4V 36V 12V

Incorrect!Incorrect!

The sum of currents in the branches The sum of currents in the branches will equal the current drawn from the will equal the current drawn from the supply.supply.

Correct!Correct!

The sum of currents in the branches The sum of currents in the branches equal the supply current so the current in equal the supply current so the current in each branch must be 1 amp.each branch must be 1 amp.

ContinueContinue

No!! In a parallel circuit the voltage No!! In a parallel circuit the voltage across each branch equals the across each branch equals the battery voltage! battery voltage!

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Very good! The voltage across the Very good! The voltage across the resistor must equal the battery resistor must equal the battery voltage.. 12Vvoltage.. 12V

Carry on..Carry on..

How could you increase the How could you increase the strength of an electromagnet ?strength of an electromagnet ?

Decrease the current through the wires

Increase the number of coils around the core

Remove the core

That’s wrong !! That’s wrong !!

Without a core the electromagnet would not Without a core the electromagnet would not workwork

Decreasing the current would decrease its Decreasing the current would decrease its strength strength

Try againTry again

Very good! Very good!

The electromagnet’s strength is increased The electromagnet’s strength is increased by increasing the number of coilsby increasing the number of coils

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