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

i)

Given :-

Potential difference of bulb = 100W

Voltage :- 220V

To find :-

Electric current passing through bulb ( I )

Solution :-

We know that P = VI therefore I = P/V

= 100/220 = 10/22 = 5/11

Electric current passing through bulb = 5/11 A

ii)

Given :-

Potential difference of bulb = 100W

Voltage :- 110V

To find :-

Electric current passing through bulb ( I )

Solution :-

I = P/V = 100/110 = 10/11 A

Therefore, electric current passing through the bulb when connected to mains in USA = 10/11 A

Answer 2

Question:

A 100 W electric bulb is connected to 220 V mains power supply. Calculate the strength of the electric current passing through the bulb.

Solution:

Here ...

Potential difference (P) = 100W

Voltage (V) = 220V

_________ [ GIVEN ]

• We have to find the current (I)

______________________________

We know that..

→ P = VI

→ I = $\dfrac{P}{V}$

→ I = $\dfrac{100}{220}$

→ I = $\dfrac{10}{22}$

→ I = $\dfrac{5}{11}$ A

_____________________________

$\dfrac{5}{11}$ A current pass through the bulb.

_________ [ ANSWER ]

_____________________________

Question:

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?

Solution:

Potential difference (P) = 100 W

Voltage = 110 V

___________ [ GIVEN ]

• We have to find the current (I) passing through the bulb when connected in mains.

______________________________

→ I = $\dfrac{P}{V}$

→ I = $\dfrac{100}{110}$

→ I = $\dfrac{10}{11}$ A

______________________________

$\dfrac{10}{11}$ A current pass through the bulb when connected in mains in U.S.A.

_________ [ ANSWER ]

______________________________