The power dissipated in a wire carrying a constant electric current I may be written…
PHYSICS · Single correct · A Level · Physics · Electricity · Electricity
Problem
18. The power dissipated in a wire carrying a constant electric current I may be written as a function of I, the length l of the wire, the diameter d of the wire, and the resistivity ρ of the material in the wire. In this expression, the power dissipated is directly proportional to which of the following?
(A) l only
(B) d only
(C) l and ρ only
(D) d and ρ only
(E) l, d, and ρ