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?

Guest Mar 15, 2020

#1**+1 **

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

ElectricPavlov Mar 15, 2020

#2

#6**+1 **

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 !

ElectricPavlov
Mar 15, 2020