Question

An electric bulb is rated 220 V and 5 W. a) Calculate the current required. b) Calculate the resistance of its heating element. c) When it is operated on 110 V, what will be the power consumed? Please answer

Answer 1

(a)

Given :-

• v = 220V
• p = 5 W
• I = ?

we know that,

P = V x I

so,

I = P/V

I = 5/220

I = 0.02 A

(b)

V = I x R (ohm's law)

So,

R = V/I

R = 200/0.02

R = 2000/0.2

R = 20000/2

R = 10000 Ω

(c)

Given :-

• V = 110 V
• I = 0.02
• P = ?

we know that,

P = V x I

P = 110 x 0.02

P = 2.2 W

Answer 2

$\huge{\red{\underline {\underline {Question}}}}$

An electric bulb is rated 220 V and 5 W.

a) Calculate the current required.

b) Calculate the resistance of its heating element.

c) When it is operated on 110 V, what will be the power consumed?

$\huge{\red{\underline {\underline {Answer:-}}}}$

(a) Given :-

V= 220V

P = 5 W

I = ?

Formula,

P = V x I

So,

I = P/V

I = 5/220

Ans. I = 0.02 A ✔

____________________________

(b) V = I x R {Ω law}

So, R = V/I

R = 200/0.02

R = 2000/0.2

R = 20000/2

ans. R = 10000 Ω✔

____________________________

(c) Given :-

V = 110 V

I = 0.02

P = ?

Formula,

P = V x I

P = 110 x 0.02

ans. P = 2.2 W✔

_____________________________

Hence, Solved✔