Answer to Question #3827 in Electric Circuits for mia

Question #3827
A generator in a power plant develops a maximum voltage of 170 V. <br>a. What is the effective voltage? <br>b. A 60 W light bulb is placed across the generator. A maximum current of 0.70 A flows through the bulb. What effective current flows through the bulb? <br>c. What is the resistance of the light bulb when it is working?
1
Expert's answer
2011-08-05T11:29:57-0400
a. Effective voltage is Vmax/√2 = 170/√2= 120.2 V
b. Effective current is Imax/√2= 0.7/√2 = 0.49 I
c. The resistance is R = 2W/Imax2 from the law W = I2/R = Imax2 /2R
R = 2*60 / 0.72 = 244.89 Ohm

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