Question

4.
A 220 V, 1000 W bulb is connected across a
110 V mains supply. The power consumed will
be
(a) 1000 W
(b) 750 W
(c) 500 W
(d) 250 W​

Answer 1

Option c 500 watt

$\large{\underline{\boxed{ Answer}}}$

Power of bulb = 1000w

Voltage = 220 v

then current will flow through it.

$p = v \times i$

$= > i = \frac{1000}{220}$

$= > i = 4.54ampre$

When it is connected with 110 volt

then,

$p = vi$

$= > p = 110 \times 4.54$

$= > p = 500watt$

hence, power consumed by bulb is 500 watt.

Answer 2

Answer:

Given Voltage , V= 220V

Power , P=1000W.

Then current flowing through 220V battery will be

P= V×I

I=P/V

I=1000/220

I=4.54 A

Now , when the bulb is connected with 110V battery then

P= V×I

P=110×4.54

Power, P=500W.