In physics, Ohm's law says that current through a wire, I, is directly proportional to voltage, V, and inversely proportional to resistance, R :
I = V/R
It's also true that resistance is directly proportional to the length of the wire. We have a piece of wire. We pass 50 volts through this wire and measure 300 milliamps of current. If I cut the wire in half and pass 300 volts through it, how many milliamps of current will I measure?
+36916 I = V/R
Initially .300 = 50/R R = 166.667 ohms Cutting the wire in half also cuts R in half to 83,33 ohms
I = 300/83.33 = 3.6 amps = 3600 mAmps
