Question

Calculate resistance of a bulb and highest current flowing through it having rating of `220V - 100W` ?

Calculate resistance of a bulb and highest current flowing through it having rating of `220V - 100W` .

Answer 1

The resistance is `=484Omega`

Explanation:

Apply Ohm's Law

`U=RI`

`"Voltage"="Resistance"xx "Current"`

and

`P=UI`

`"Power"= "Voltage"xx"Current"`

The power is `P=100W`

The Voltage is `U=220V`

The current is `I=P/U=100/220=0.45A`

The resistance is

`R=U/I=220/0.45=484Omega`