Some solids conduct heat very well

Metal conducts heat very well but cork doesn’t - which is why the wax melts off of the end where it’s attached to the wire, but not off the end where it’s attached to the cork

Some Solids Conduct Heat Poorly

Which is why we put hot drinks into polystyrene cups rather than glass beakers - to keep them warm and stop us burning our hands!

Some materials are also good electrical conductors

Which is why we make electrical circuits out of metal wire and not strips of wood or rubber bands!

But some materials are not good electrical conductors

So if we put cork in the circuit the bulb doesn’t light up. Another bad conductor is plastic which is why we coat electrical wires with plastic - to make them safe to handle!