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Chapter 32: Q. 34 (page 925)

The heating element of a hair drier dissipates 1500Wwhen connected to a 120V/60Hzpower line. What is its resistance?

Short Answer

Expert verified

In a circuit power is dissipated by resistance only.

Step by step solution

01

Given information

We have given the values ,

P=1500WV=120Vf=60Hz

02

Calculation

In a circuit power is dissipated by resistance elements only.

So using formula of power dissipation i.e

P=V2R

Substituting given values in above equation, we get

localid="1649924337177" 1500=(120)2/RR=(120)2/1500R=9.6Ω

Hence, required value of resistance is localid="1649924341773" 9.6Ω

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Most popular questions from this chapter

In the series RLC circuit represented by the phasors of FIGURE Q32.7, is the EMF frequency less than, equal to, or greater than the resonance frequency ω0? Explain.

FIGURE Q32.1shows emf phasors a, b, and c.

a. For each, what is the instantaneous value of the emf?

b. At this instant, is the magnitude of each emf increasing, decreasing, or holding constant?

The telecommunication circuit shown in FIGURE CP32.71 has a parallel inductor and capacitor in series with a resistor.

a. Use a phasor diagram to show that the peak current through the resistor is

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b. What is I in the limits ω→0and ω→∞?

c. What is the resonance frequency ω0? What is I at this frequency?

An inductor is connected to a 15KHzoscillator. The peak current is 65mAwhen the rms voltage is width="36">6.0V. What is the value of the inductance L?

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