Question

A lamp rated 100W at 220 V is connected to the mains Electric Supply.
(i) What amount of current is drawn from the supply line if the voltage is 220 V?
(ii) what is its resistance?​

Answer 1

Answer:

Heya,

Explanation:

1. Power , ( P ) = 100 W

Voltage, ( V ) = 220V

Current ( I ) = ?

To find current,

P = VI

I = P / V

I = 100 W / 220V

I = 0.45 A

2. To find resistance,

P = V2 / R

100 W = 220 × 220 / R

R = 484 ohm.

__________________

hope it helps.

Thanks!!

Answer 2

Answer:

Power = 100 W

Potential Difference = 220 V

Current = ?

P = IV

100 = I*220

100/220 = I

0.454 A = I

V = IR

R = ?

220 = 0.454*R

220/0.454 = R

484.58 Ohms = R