Question

6) Assertion: the brightness of light bulb in room decreases, when heavy current appliance is
switched on
Reason: there will be no change in the brightness of the bulb in a room, if the source and
connecting wires are idle. ​

Answer 1

Answer:

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Answer 2

The brightness of light bulb in room decreases, when heavy current appliance is  switched on.

Explanation:

• Switching on a heavy load (current appliances) in parallel with the bulb, a heavy load draws large current from the circuit.

• As a one kW heater will consume 4.4A at 230V. This current now will produce significant voltage drop which can be even a few volts in some cases.  
• Since the light bulb is in parallel with this heavy load (current appliances), cause decrease in terminal voltage affects the lamp too which is the reason for decrease in brightness of the light bulb.