Question

The figure below shows an electric circuit with two bulbs B1 and B2 which are identical.

Explain what happens to the bulbs when

1. S₁ only is closed 
2. S₁ and S₂ are closed 

Answer 1

1. Both bulbs light with the same brightness – they receive the same amount of current
2. Only bulb B1 light.  Bulb B2 is short circuited