5. METHOD
1.
Connect your circuit as shown.
2.
Fill the water cooled resistor so
that the the wire is submerged in
water.
3.
Record the initial temperature of
the water before the power is
switched on.
4.
Set the power pack to 4 V, turn it
on and start the stopwatch.
Record the reading on the
ammeter and voltmeter.
6. METHOD
5. Measure the temperature
of the water every 2
minutes for 10 minutes.
Make sure you turn the
power off when
measuring the
temperature.
6. Record your data in the
table.
7. Draw a graph to illustrate
the temperature change.
7. RESULTS
• Ammeter Reading: _____________
• Voltmeter Reading: _____________
(Heading for your table)
Time (minutes)
0
2
4
6
8
10
Temperature (°C)
8. DISCUSSION
1.
2.
3.
4.
5.
6.
7.
Explain where most of the energy supplied by the power pack is being
transferred.
Using your graph, predict what the temperature would have risen to if
the water was heated another 10 minutes.
Would the temperature keep rising if the water was heated for a much
longer time? Justify your answer.
The electrical power (in watts) delivered to an electrical device can be
calculated by multiplying the voltage across the device by the electric
current (in amperes) flowing through the device. Calculate the power
delivered to your electric kettle.
What happens to the energy supplied to your electric kettle that is not
used to raise the temperature of the water?
Do you think that the wire used in your model has high resistance or low
resistance? How would this help in heating the water?
Do you think your model electric kettle was a good representation of a
real kettle? Justify your response.
