question 1 This is slowing the flow of electrons (the current) and where some of the electrons' energy gets converted into heat.
question 2 These stop the electricity from flowing (think rubber and glass).
question 3 This is a flow of electrons (such as the flow of electrons in a wire to light up a lamp).
question 4These allow electricity to flow easily through them (think copper and aluminum).
1. Electric Current
2. Resistance
3. Conductor
4. Insulator