(a) What is the resistance of a lightbulb that uses an average power of 60.0 W w

Question

(a) What is the resistance of a lightbulb that uses an average power of 60.0 W when connected to a 60.0-Hz power source having a maximum voltage of 156 V? Incorrect: Your answer is incorrect. . Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. (b) What is the resistance of a 75.0-W lightbulb? Incorrect: Your answer is incorrect. . Your response differs from the correct answer by more than 10%. Double check your calculations.

Explanation / Answer

here,

(a)

average power , P = 60 W

maximum voltage , V = 156 V

Vrms = V /sqrt(2)

Vrms = 110.31 V

let the resistance be R

Vrms^2 / R = P

110.31^2 / R = 60

R = 202.8 ohm

b)

average power , P = 75 W

maximum voltage , V = 156 V

Vrms = V /sqrt(2)

Vrms = 110.31 V

let the resistance be R

Vrms^2 / R = P

110.31^2 / R = 75

R = 162.24 ohm

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