A copper wire with a cross sectional area of 3.00 mm^2 and a length of 2.00 m at 20.0 degrees C is connected to a 25.0 V battery.
(a) what is the resistance at 20.0 degrees C?
(b) what is its resistance and -50.0 C (wire dimensions remain constant)?
(c) How many additional amperes flow in the wire at -50.0 C than flow at 20.0C?