1. calculate how many electrons you need to get a charge of 1 coulomb.

2. calculate the charge that flows through the cross-section of a wire in 60 seconds at a current of 100ma. how many electrons are needed to get that charge?

3. there is an electrical voltage of 5 volts between two points. what does that mean? use the words work and energy in your explanation.

4. right or wrong?
- voltage is the consequence and current is the cause
- a battery and a socket are both voltage sources.
- an electric current can only flow in a closed circuit.