Question: A heating element is made by maintaining a potential difference of 75 .0 V across the length of a Ni chrome wire that has a

A heating element is made by maintaining a potential difference of 75 .0 V across the length of a Ni chrome wire that has a 2.60 x 10-6 m2 cross section. Ni chrome has a resistivity of 5.00 x 10-7 Ω ∙ m.

(a) If the element dissipates 5000 W what is its length?

(b) If 100 V is used to obtain the same dissipation rate, what should the length be?

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