In physics, Ohm's law says that current through a wire, \(I\), is directly proportional to voltage, \(V \), and inversely proportional to resistance, \(R\) :
\(I=\frac{V}{R}\)
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 200 milliamps of current. If I cut the wire in half and pass 250 volts through it, how many milliamps of current will I measure?
+36916 If you put 250 volts ACROSS the wire (you don't put voltage THROUGH a wire) the curent woud increase through the wire
250/50= by 5 times 5 x 200 ma = 1 amp
EDIT:::::
BUT you cut the wire in half....this cuts the resistance in HALF
cutting the resistance in half will DOUBLE the current through the wire
1 amp x 2 = 2 amps = 2000 millimps
+36916 Thanx GA....missed the 1/2 as long part !!!!!
I apologize !!!!!
the voltage increased 5 times and the resistance is cut in half so the current will increase 5 x 2 times
10 x 200 = 2000 mamps
D'Oh !
