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The heating element in a hair dryer is essentially a wire whose resistance causes it to...

The heating element in a hair dryer is essentially a wire whose resistance causes it to become red-hot when a current exisits in it. Such wires are usually made of nichrome (a nickel-chromium alloy), whose resistivity is p=1.0*10^-6 ohm*m.

(a) ​Suppose one such wire has a diameter of 0.30 mm and a resistance of 9.0 ohm. What is the length of the wire? (Note that wires like this in a hair dyrer tend to be coiled around to save space)

(b) When the hair dryer is plugged in to a 120-V outlet and turned on, what power is dissipated in the wire? Assume the wire is only significant resistance in the circuit.

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Answer #1

S olution en 636. 12 vwwn we knouo that Power, p- VI =(12.0 16 Watt

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