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In electrical wiring, which of the following are proportional?

A the diameter of the wire and the amount of the current
Explaination
Current flow through a wire increases the temperature of the wire. If too small a wire is used, the wire will heat up causing a loss in conductivity and possibly a fire. The thicker in diameter a wire is, the more current it can carry without overheating.
B the length of the wire and the amount of the current
C the diameter of the wire and the amount of the voltage
D the length of the wire and the amount of the voltage