EXPERIMENT (3)

C) Brightness of bulbs connected in a series and parallel circuits

Aim
To compare the brightness of bulbs connected in a series and parallel circuits

Problem
How does the type of circuit used affects the brightness of bulbs?

• What to change: The type of circuit
• What to observe: The brightness of the bulbs
• What to keep the same: The number and type of bulbs and dry cells

Steps

Circuit R

Circuit S

1. Two bulbs are connected
    (a) in series as in circuit R
    (b) in parallel as in circuit S
2. The switches in both circuit are closed at the same time.
    The brightness of the bulbs in circuits R and S are compared.

Observation

Circuit	Brightness of bulbs
R	Dimmer
S	Brighter

Conclusion
The bulbs in parallel in a circuit shine brighter than the bulbs in a series circuit if similar bulbs and dry cells are used.