Question

An electric lamp is marked 100w 220v. What do you

understand by this? what current is taken by the lamp when it is connected to a 220v main supply. What is the resistance
of the lamp.​

Answer 1

The current is "
`(5)/(11) \ A`" and resistance is "484 ohm".

Step-by-step explanation:

The given values are:

Potential difference,

V = 220 v

Power,

P = 100 w

Now,

The current will be:

⇒
`P=VI`

On putting the values, we get

⇒
`100=220* I`

⇒
`I=(100)/(220)`

⇒
`= (5)/(11)` A

then,

Resistance will be:

⇒
`V=IR`

⇒
`220=(5)/(11)* R`

⇒
`R=44* 11`

⇒
`=484` ohm