Question

Calculate the resistance of an electric bulb which allows a 10 A current when connected to a 220 V power source

Answer 1

Here we have been given with a bulb whose voltage is of 220V and it allows 10A current to flow from it.

(Remember that A is Ampere and it's the unit of current and V is volt it is the unit of voltage)

• V = 220V
• I = 10A
• R = ?

We have to calculate the resistance. So we would use Ohm's law.

As we know that,

• V = IR

here,

• V is voltage
• I is current
• R is Resistance

Substituting the values,

=> 220 = 10R

=> 220 = 10 × R

=> R = 220/10

=> R = 22 / 1

=> R = 22

Resistance is measured in ohms and it's symbol is Ω.

Therefore,

• Resistance is of 22Ω

Answer 2

Resistance can be calculated by Ohm's law

As per ohm's law we will have

`V = i * R`

here we will have

voltage = 220 volts

current = 10 A

So by the above formula we will have

`220 = 10* R`

`R = 22 ohm`

So resistance of the bulb is 22 ohm.