To investigate, describe and recall how the strength of the magnetic field depends on the current in the coil, the number of turns in the coil and the material used as the core of the coil.
The main variables in a science experiment are the independent variable, the dependent variable and the control variables.
The Independent Variable is what we change or control in the experiment.
The Dependent Variable is what we are testing and will be measured in the experiment.
The Control Variables are what we keep the same during the experiment to make sure it’s a fair test.
In this experiment the:
Remember - these variables are controlled (or kept the same) because to make it a fair test, only 1 variable can be changed, which in this case is the current.
As the current increases, the electromagnet will get stronger and hold more paper clips.
The magnetic field is caused by the current flowing in the wire.
The bigger the current the stronger the magnetic field and hence the stronger the electromagnet.
|Water||Electric shock||Do not set up the experiment near taps, sinks etc.|
|Wire gets hot||Minor burns||Do not handle the wire. Switch off between readings. Do not exceed a current of 1 A.|
1m length of insulated wire, iron nail, a variable low voltage power pack, an ammeter, connecting leads, a retort stand, a boss and clamp, 2 crocodile clips, paper clips.
Ensure that the paper clips are the same size and material. They should not be too big.