# An electric bulb is rated 220V and 100W. When it is operated on 110V, what will be the power consumed?

By BYJU'S Exam Prep

Updated on: September 25th, 2023

An electric bulb is rated 220V and 100W. When it is operated on 110V, the power consumed will be 25 watts. Power can be defined as the amount of work completed in a given amount of time. Watt (W), which is derived from joules per second (J/s), is the SI unit of power. Horsepower (hp), which is roughly equivalent to 745.7 watts, is a unit of measurement sometimes used to describe the power of motor vehicles and other devices.

### Calculation of Power Consumed

Step1: Given the data

• The bulb’s power rating is P = 100W
• The bulb’s voltage rating is V = 220V
• Voltage must be found for power 110 V

Step2: Electrical power

Electrical power is the amount of energy a circuit uses in a certain period of time. The design of an electrical circuit determines its strength, P = V2/R where, The circuit’s resistance is R, and voltage is V.

Step3: Diagram

Step4: Finding the resistance

As we know, P = V2/R

So, the resistance of the circuit is R = V2/P

or R = V2/P = 2202/100 = 48400/100 = 484

or R = 484 ohm

Step5: obtaining electricity at 110V

The power of an electrical circuit is P = V2/R

So P = V2/R = 1102/484 = 25

or P = 25 watts

Consequently, the circuit’s power consumption at 110 volts is 25 watts.

Summary:

## An electric bulb is rated 220V and 100W. When it is operated on 110V, what will be the power consumed?

A 100W, 220V electric bulb is rated. The amount of power used when using 110V is 25 watts. Power is the work finished in a given time. The SI unit of power is Watt which is derived from Joules per second.

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