Quiz: what electricity is

Question 1What is an electric current?

1. Stored energy in a battery
2. Charge flowing past a point each second
3. The push between two points
4. The heat in a wire

Question 2Voltage is best described as:

1. The amount of charge in a wire
2. The energy given to each coulomb - the push between two points
3. The speed of the electrons
4. The resistance of the circuit

Question 3Why does copper conduct electricity well?

1. It is heavy
2. It has many free electrons that can move
3. It is magnetic
4. It contains water

Question 43 A flows for 20 s. How much charge passes?

Question 5A switch in a working circuit is opened. What happens to the current?

1. It stops only after the switch
2. It stops everywhere in that loop at once
3. It keeps flowing slowly
4. It flows backwards

Question 6What is the resistance of 20 m of 1 mm² copper wire? (ρ = 1.68 × 10⁻⁸ Ω·m)

Question 7With a lamp's switch open, a meter across the open switch shows:

1. 0 V
2. Half the battery voltage
3. The full battery voltage
4. A negative voltage