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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 20 - Heating Effects of Current and Instruments > The main supply voltage to room is 120V. The resistance of the lead wires is 6Ω. A 60W bulb is already giving light. What is the decrease of voltage across the bulb, when a 240W heater is switched on ?

The main supply voltage to room is 120V. The resistance of the lead wires is 6Ω. A 60W bulb is already giving light. What is the decrease of voltage across the bulb, when a 240W heater is switched on ?

The main supply voltage to room is 120V. The resistance of the lead wires is 6Ω. A 60W bulb is already giving light. What is the decrease of voltage across the bulb when a 240W heater is switched on ?