Question

A bulb rated (220V, 100W) is connected across a power supply of 110V. The power consumed by
bulb is

Answer 1

answer is 140 v ok than you

Answer 2

Answer:

The power consumed by bulb = P = 25 W

Step-by-step explanation:

Given:

• A bulb rated 220 V and 100 W.

To find:

• The power consumed by bulb when connected across a power supply of 110V.

Solution:

We know,

✰ P = V²/R

Where,

P is the consumed by an electrical appliance.

V is the volt.

R is the resistance of an appliance.

Here,

P = 100 W

V = 220 V

R = ? ( we need to find )

Putting the values,

• 100 = 220²/R
• 100 = 48400/R
• R = 48400/100 Ω
• R = 484 Ω

∴ The resistance of a bulb = 484 Ω

Finally,

Again use..

✰ P = V²/R

Where,

P is the consumed by an electrical appliance.

V is the volt.

R is the resistance of an appliance.

Here,

P = ? ( we need to find )

V = 110 V

R = 484 Ω

Putting the values,

• P = 110²/484
• P = 12100/484
• P = 3025/121
• P = 25 W

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