Homework task HP2.17.1
Lesson reference: P2.17 Current and potential
difference
Charge!
Learning objectives:
 Understand that electric current is the rate of flow of charge.
Suggested time:
30 minutes
Name: _________________________________ Date: ____________________
Electric kettle (13A)
Small lamp (3A)
Washing machine (13A)
Video game console (3A)
TV (3A)
Microwave oven (13A)
For the six devices above, make a note of the length of time that each device is
‘on’ when used once, and answer the following questions. You should assume
that the supply voltage is 230V for all of them.
Time on:
Electric kettle
__________________
Washing machine
__________________
TV
__________________
Small lamp
__________________
Video game console __________________
Microwave oven
__________________
A Calculate the charge (C) for each device:
Electric kettle
________________________________________________________________
Washing machine
________________________________________________________________
TV
________________________________________________________________
Video game console
________________________________________________________________
© Oxford University Press 2011
This document may have been altered from the original.
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Small lamp
________________________________________________________________
Microwave oven
________________________________________________________________
B Use the value for charge to calculate the energy transferred by each device (J)
when it is used once:
Electric kettle
________________________________________________________________
Washing machine
________________________________________________________________
TV
________________________________________________________________
Video game console
________________________________________________________________
Small lamp
________________________________________________________________
Microwave oven
________________________________________________________________
C Which device has the greatest charge?
________________________________________________________________
D How long must the small lamp be switched ‘on’ to match the charge for one
use of the washing machine?
________________________________________________________________
© Oxford University Press 2011
This document may have been altered from the original.
791