Transcript Electricity and Circuits

S2 Electricity and circuits
Revision Quiz
To begin click the button below
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 …
A Conductor
Electrical
An Insulator
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
Blows
Gets brighter
Goes Out
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
Stay the same
brightness
Get dimmer
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
ohmmeter
ammeter
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?
Amps
Volts
Ohms
Correct! That was an easy
one…. Current is measured in
Amps with the unit symbol A
Click to continue
No! Volts is the unit of measure
of the voltage!
Try again
Incorrect! Ohms is not a
measure of current… it’s the
measure of resistance
Try again
The circuit below shows two bulbs in ?
Series
Parallel
Correct!
The bulbs are connected
series with each other.
in
Wrong! The bulbs are
connected in a single
continuous circuit… a
series circuit!
In the circuit below which
bulbs will be lit when the
switch is open?
Both bulbs
Bulb 1 only
Neither bulb
No… If the switch is open there
is not a complete circuit and so
no current will flow.
Neither bulb will light
Good! If the switch is open there
is no current flowing so neither
bulb will light.
Carry on…
If the reading on ammeter 1 is 1A what will
be the reading on ammeter 2 if the bulbs
are considered identical?
0A
1A
0.5A
Incorrect! In a series circuit the
current is the same at all points
Try again..
Correct! The current measured at
any point will be the same in a
series circuit.
Continue..
What is the reading on the
voltmeter if the bulbs are
identical?
18V
4.5V
9V
In a series circuit if the bulbs are
identical the battery voltage will be
divided evenly between them..
Try again
Well done! The battery voltage of 9V will
be split evenly between the two bulbs.
Carry on..
In the parallel circuit below, with identical
resistors, what will be the reading on the
voltmeter?
6V
12V
3V
Yes! The voltage across each branch of
the circuit will be equal to the battery
voltage.
Continue
Oops! Remember the voltage across each
branch of a parallel circuit is equal to the
battery voltage.
Try again
If all the resistors are identical what will be
the reading on the ammeter?
3A
9A
1A
For the same circuit what will be the
reading on the voltmeter?
4V
36V
12V
Incorrect!
The sum of currents in the branches
will equal the current drawn from the
supply.
Correct!
The sum of currents in the branches
equal the supply current so the current in
each branch must be 1 amp.
Continue
No!! In a parallel circuit the voltage
across each branch equals the
battery voltage!
Try again
Very good! The voltage across the
resistor must equal the battery
voltage.. 12V
Carry on..
How could you increase the
strength of an electromagnet ?
Decrease the current through the wires
Increase the number of coils around the core
Remove the core
That’s wrong !!
Without a core the electromagnet would not
work
Decreasing the current would decrease its
strength
Try again
Very good!
The electromagnet’s strength is increased
by increasing the number of coils
Congratulations!!
• You’ve finished the quiz!
• You can do the quiz again if you want
• Revise to be prepared for your test
• Start again
End