UNIT TITLE Using circuits to control a fairground ride YEAR GROUP(S) 6
Session 4 of 6 Investigation - Changing wires in a circuit Timing 2 hours
Children should learn
That the speed of a motor can be changed by changing wires in a circuit switches
To decide how to test a question to investigate and to choose the crocodile clips
equipment that is needed to do this range of fuse wires
To make fair comparisons and draw conclusions construction kit models of
To explain observations in terms of knowledge of electrical circuits fairground rides
Remind children about electrical circuits and the key components. Explain that
fairground rides will use wires, motors and switches in their circuits. Tell the
children that one fairground decided that using thinner wires for the circuits
would be a good idea because it would be cheaper. Ask the children if they think
this might be a good idea – will thinner wires make a difference to the circuit?
Children design and build a simple motor circuit that incorporates a wire
that can be tested. Ideas to be tested could be ‘same lengths different
thicknesses’, ‘same thickness different lengths’. Their circuits could be
tested on construction kit models of fairground rides.
Children will need to decide on the criteria for judging the effect of
changing the wires.
Investigation should be carried out fairly and comparisons made of the
effect of changing the wires.
Relate findings to the effect of changing the wires in a bulb circuit.
Discuss whether using thinner wires in a fairground ride would be a good idea and why.