Question

(b) (i) A 100 W electric bulb is connected to 220 V mains power supply. Calculate the strength of the electric current passing through the bulb. (ii) If the same bulb is taken to U.S.A where the main power supply is 110 V, how much electric current will pass through the bulb when connected to mains?

Answer 1

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Answer 2

i). 5/11 A

ii). 10/11 A

Explanation:

i). Given that,

Potential difference of bulb(P) = 100W

Voltage(V) = 220V

Now,

Electric current passing through bulb(I) = ?

As we know,

Potential difference of bulb(P) = Voltage(V) * Electric current passing through(I)

so,

I = P/V

= 100/220

= 5/11 A

ii). Given that,

Potential difference of bulb(P) = 100W

Voltage(V) = 110V

Now,

Electric current passing through bulb(I) = ?

As we know,

Potential difference of bulb(P) = Voltage(V) * Electric current passing through(I)

so,

I = P/V

= 100/110

= 10/11 A

Learn more: Strength of electric current

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