SOLUTION: 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 resistanc

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Question 934425: 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 12 volts through this wire and measure 100 milliamps of current. If I cut the wire in half and pass 24 volts through it, how many milliamps of current will I measure?

Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
1 milliamp = 1/1000 amp
1000 milliamp/amp
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v = ir
r = v/i
i = v/r
---
r = 12/(100/1000)
r = 120 ohm
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half wire resistance:
(1/2)r = 60 ohm
---
i = v/r
i = 24/60
i = 0.400 amp
i = (0.400 amp) * (1000 milliamp/amp)
i = 400 milliamp
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