He heating element of an electric dryer is rated at 4.1 kw when connected to a 240-v line. part a what is the current in the heating element? express your answer using two significant figures. i = a submitmy answersgive up part b is 12-gauge wire large enough to supply this current? is 12-gauge wire large enough to supply this current? yes no submitmy answersgive up part c what is the resistance of the dryer's heating element at its operating temperature? express your answer using two significant figures. r = ω submitmy answersgive up part d at 11 cents per kwh, how much does it cost per hour to operate the dryer? express your answer using two significant figures. cent

Question

Physics

Philip Harrell

18 May, 10:12

He heating element of an electric dryer is rated at 4.1 kw when connected to a 240-v line. part a what is the current in the heating element? express your answer using two significant figures. i = a submitmy answersgive up part b is 12-gauge wire large enough to supply this current? is 12-gauge wire large enough to supply this current? yes no submitmy answersgive up part c what is the resistance of the dryer's heating element at its operating temperature? express your answer using two significant figures. r = ω submitmy answersgive up part d at 11 cents per kwh, how much does it cost per hour to operate the dryer? express your answer using two significant figures. cent

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Answers (1)

Know the Answer?

Roy West · Answer 1

Part A. The formula relating electric power, voltage and current is:

P = I V

I = P / V

I = 4,100 W / 240 V

I = 17.08333 A

I = 17.08 A

Part B. The maximum amount of current an electrical wire can conduct is measure in terms of Ampacity. For a 12-gauge wire the Ampacity is greater than 20 A. Therefore the answer to this is "Yes".

Part C. The formula for resistance is:

R = V / I

R = 240 V / 17.08 A

R = 14.05 Ω

Part D. The cost per hour is:

(11 cents / kwh) (4.1 kw) = 45.1 cents / hr