A voltage-current graph for a thermistor is shown below. Voltage - Current graph for a thermistor as current and temperature rise.

Watts are units of electric power. Think of wattage as electricity at work when heating or illuminating a room in your home.

Explore Ohm's Law and its key relationship between voltage, current, and resistance in conductors and quantum mechanics.

The filament lamp does not follow Ohm's Law. Its resistance increases ... You should be able to recognise the graph of current against voltage for a diode. The diode has a very high resistance ...