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The diagram shows a simple circuit: the cell provides energy, V volts, which causes a current, I amps, to flow around the circuit. There is also a resistance, R ohms.
This circuit provides a simple model for what happens in an electric kettle: a resistance converts electrical energy into heat energy by impeding the flow of electrons around the circuit.
The table shows data collected from a circuit like this.
Resistance (ohms) | Temperature (degrees Celsius) |
5 | 44.9 |
6 | 50 |
7 | 55.1 |
8 | 59.9 |
9 | 65 |
10 | 70.1 |
Once you have found the equation, discuss these questions: