n identical light bulbs, each designed to draw P power from a certain voltage supply, are joined in series across that supply. The total power which they will draw is

Electric power is the rate at which work is done or energy is transformed into an electrical circuit. Simply put, it is a measure of how much energy is used in a span of time.


The formula for electric power is given by

P = VI

P is the power

V is the potential difference in the circuit

I is the electric current

Power can also be expressed as

P = I2R
P = V2/ R
The above two expressions are got by using Ohm’s law, Where, Voltage, current, and resistance are related by the following relation

V = IR
R is the resistance in the circuit.
V is the potential difference in the circuit
I is the electric current


Let us assume

Voltage of the source is V

Resistance of each bulb is R

∴ R = V2/P

Power drawn by each bulb = i2R = V2/n2R2. R

= V2/n2R

= P/n2

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