Electricity P5

Question 1

Closed vs Open Circuits

Answer 1

1. A closed circuit is when all components are properly connected to each other with wires without any gaps. Electric current can flow through the circuit
2. An open circuit is when electric current cannot flow through the circuit. This could be because:
   - there are gaps eg wire not connected properly or a switch is left open
   - positive battery terminal is wrongly connected to another positive instead of a negative terminal

Question 2

Bulbs arranged in Series

Answer 2

1. When more bulbs are added, the electric current passing through each bulb decreases.
2. The brightness of each bulb thus decreases.
3. Battery is used at the same rate.

Question 3

Bulbs arranged in Parallel

Answer 3

1. When more bulbs are added in parallel, the electric current passing through each bulb remains the same.
2. Brightness of each bulb thus remains the same.
3. However, the batteries are depleted faster

Question 4

Batteries arranged in Series

Answer 4

1. When more batteries are added in series, the electric current passing through each bulb increases.
2. Brightness of each bulb increases