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Chapter 4: Q36E (page 843)

If a 鈥�75-W鈥� bulb (see Problem 25.35) is connected across a 220-V potential difference (as is used in Europe), how much power does it dissipate? Ignore the temperature dependence of the bulb鈥檚 resistance.

Short Answer

Expert verified

The power dissipated across 220-V is 252 W.

Step by step solution

01

Concept of Electric Power.

The electrical energy flowing through or transferred by an electric circuit in unit time is the definition of electric power. It is nothing by the rate at which the electrical energy flows through the circuit.

P=EtJ/s

02

(b) Determination of the power dissipation.

The connection of the bulb is across a 120-V potential difference.

The expression of power is,

P=V2R

Solve for R and 75-W bulb,

R=V2P=120V275W=192惟

The connection of the bulb is across a 220-V potential difference.

The expression of power is,

P=V2RP=(220V)2(192惟)=252WThus,thepowerdissipatedis252W.

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