1. The heating element of a clothes dryer has a resistance of9 and is connecteda

Question

1. The heating element of a clothes dryer has a resistance of9 and is connectedacross a 120 V outlet. What is thecurrent in the heating element?
2. The filament in an incandescent light bulb is made fromtungsten. The light bulb is plugged into a 240 V outlet and draws a current of 1.4 A. If the radius of the tungsten wire is0.003 mm, how long must the wirebe? 1. The heating element of a clothes dryer has a resistance of9 and is connectedacross a 120 V outlet. What is thecurrent in the heating element?
2. The filament in an incandescent light bulb is made fromtungsten. The light bulb is plugged into a 240 V outlet and draws a current of 1.4 A. If the radius of the tungsten wire is0.003 mm, how long must the wirebe?

Explanation / Answer

1) The current in the heating element is                   I = V/R                       =(120 V)/(9) 2) The resistance of the wire is                          R = V/I                             = (240 V)/(1.40 A) We have the formula for the resistance of the wireis                          R = L/(r2) The length of the wire is                          L = R(r2)/ Here =5.60 × 10-8 m Substitute the values for L.

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