Question

what is the resistance of electric bulb if the bulb uses 20 amphere connected 220 volt ?
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Answer 1

Topic :-

Current Electricity

Given :-

The electric bulb uses 20 Amperes when connected with 220 Volts.

To Find :-

The Resistance of electric bulb.

Solution :-

We are provided with value of current which is used by an electric bulb when connected with a supply.

In such type of questions, we generally use the formula of Resistance, which is

R = V/I

where

R = Resistance of appliance

V = Voltage used by the appliance

I = Current used by the appliance

So, we have been given that,

I = 20 Amperes

V = 220 Volts

Applying formula,

R = V/I

R = 220/20 Ω

R = 22/2 Ω

R = 11 Ω

Answer :-

So, the resistance of given electric bulb is 11 Ω.

Additional Formulae to learn :-

P = VI

P = I²R

P = V²/R

R = ρL/A

where

P = Power used by appliance

V = Voltage used by appliance

I = Current used by appliance

R = Resistance of appliance

ρ = Resistivity of resistor

L = Length of resistor

A = Cross-section Area of resistor