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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)|
Once you have found the equation, discuss these questions:
Four vehicles travelled on a road. What can you deduce from the times that they met?
Change one equation in this pair of simultaneous equations very slightly and there is a big change in the solution. Why?
Position the lines so that they are perpendicular to each other. What can you say about the equations of perpendicular lines?