Year 12 students are learning about ohm's law for their electricity topic. In order to see Ohm's law in practice, we got students to complete an experiment where a nichrome wire is submerged in water. The long wire acts like a resistor and the water stops it from heating up keeping its resistance constant. Students then use a variable resistor to change the current in the circuit. They measure the voltage across the nichrome wire for various currents, record them and draw a graph of the results. They then do the same thing for an ordinary lamp and compare the two to see what ohm's law shows: voltage is proportional to current for ohmic conductors.