I am investigating an experiment between the current in a wire and its heating effect. I have devised a circuit where I use a variable resistor to change the current which will be measured on an ammeter. The wire will run through water in a styrofoam cup. I will leave the circuit running for a fixed period of time and measure the increase in temperature in the water. This will give me a graph with axises of temperature and current and should be a straight line.
There is one problem. As the wire heats up the resistance and so the current will change, thwarting my results. Any ideas?
There is one problem. As the wire heats up the resistance and so the current will change, thwarting my results. Any ideas?