Question

Calculate the current passing through a bulb rated 60 W, 240 V when it is connected to a supply of 220 V. [3]​

Answer 1

Answer:

As it has rated 60W 240V this means the rated current will be;

from P = V x I

60W = 240V x I

(60/240) A = I

I = 0.25A

Then for 220V it will be 0.27A approximately, so when voltage get decrease definitely current get increases.

for 240 volts current is 0.25amp

for 220 volts current is 0.27amp

Answer 2

✬ Current = 0.25 A ✬

Step-by-step explanation:

Given:

Power of bulb is 60W.

Voltage is 240V.

To Find:

How much current is passing ?

Formula to be used:

P = V \times× I

Solution: Here we have

P = 60 W

V = 240 V

I = ?

Putting the values on formula

\implies{\rm }⟹ P = VI

\implies{\rm }⟹ P/V = I

\implies{\rm }⟹ 60/240 = I

\implies{\rm }⟹ 6/24 = I

\implies{\rm }⟹ 1/4 = I

\implies{\rm }⟹ 0.25 A = I

Hence, 0.25 Ampere current is passing through the bulb.

_____________________

[ Let's see a long method ._. ]

Formula to be used:

P = V²/R

V = IR

Solution: Here we have

P = 60 W

V = 240 V

I = ?

R = ?

Put the values on first formula

\implies{\rm }⟹ P = V²/R

\implies{\rm }⟹ 60 = 240² / R

\implies{\rm }⟹ 60R = 57600

\implies{\rm }⟹ R = 57600/60

\implies{\rm }⟹ R = 960 ohms

Using the second formula for finding current

\implies{\rm }⟹ V = IR

\implies{\rm }⟹ 240 = I \times× 960

\implies{\rm }⟹ 240 = 960I

\implies{\rm }⟹ 240/960 = I

\implies{\rm }⟹ 24/96 = I

\implies{\rm }⟹ 1/4 = I

\implies{\rm }⟹ 0.25 A = I

Hence, current is 0.25 A.

❤Sweetheart❤

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