The wiring of a house has resistance $$6$$ Ω. A $$100$$ W bulb is glowing. If a geyser of $$1000$$ W is switched on, the change in potential drop across the bulb is nearly (Supply$$ voltage is $$220$$ $$V)

Question

The wiring of a house has resistance $$6$$  Ω. A $$100$$ W bulb is glowing. If a geyser of $$1000$$ W is switched on, the change in potential drop across the bulb is nearly (Supply$$ voltage is $$220$$ $$V)

Infinity Learn · Accepted Answer

RBulb $$=$$ $$2202100$$ $$=$$ $$48.4$$  Ω(i) When only bulb is ON,  VBulb $$=$$ $$220$$ × $$484490$$ $$=$$ $$217.4$$ $$V(ii)$$ When geyser is also switched ON, equivalent resistance of bulb and geyser is R $$=$$ $$484$$ × $$48.4484+48.4$$ $$=$$ $$44$$  ΩVoltage across the bulb, VBulb $$=$$ $$220$$ × $$4450$$ $$=$$ $$193.6$$ VHence, the potential drop is $$217.4$$−$$193.6=23.8$$  V

The wiring of a house has resistance $6 Ω .$ A 100 W bulb is glowing. If a geyser of 1000 W is switched on, the change in potential drop across the bulb is nearly (Supply voltage is 220 V)

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The wiring of a house has resistance 6 Ω. A 100 W bulb is glowing. If a geyser of 1000 W is switched on, the change in potential drop across the bulb is nearly (Supply voltage is 220 V)

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The wiring of a house has resistance $6 Ω .$ A 100 W bulb is glowing. If a geyser of 1000 W is switched on, the change in potential drop across the bulb is nearly (Supply voltage is 220 V)