Question

Find how the brightness is increased or decreased in a bulb by increasing the number of cells. try our the activity with 1.5v,5v,12vbulb and note down your observation ​

Answer 1

the brightness Will increase

Answer 2

1.5 V < 5 V < 12 V.

• The increase or decrease in the brightness of the bulb doesn't only depend on the number of cells but depends on their arrangement.
• Placing cells in series increases the voltage in the circuit, in turn increasing the power dissipated by the bulb.
• Increase in the power dissipation increases the brightness.
• When the cells are arranged in parallel, the voltage gets divided for every cell connected, hence there will be a decrease in the power dissipated by the bulb.
• The decrease in power dissipation decreases brightness.