+0

0
78
4

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 $300$ volts through it, how many milliamps of current will I measure?

Mar 28, 2021

#1
0

You will measure 200*300/50 = 1200 milliamps.

Mar 28, 2021
#2
0

Im sorry but thats incorrect

Mar 28, 2021
#3
+33815
+1

i = v/r

calculate r

200 = 50/r

r = 50/200

cutting wire in half makes new  r = 1/2 r

i = 300/(1/2(50/200)) = 2400 mAmps     or   2.4 amps

Mar 28, 2021
#4
0

That is correct, thanks

Mar 28, 2021