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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?

 Jul 21, 2022
 #1
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All the factors cancel, and the amount of current is exactly the same, 100 milliamps.

 Jul 21, 2022
 #2
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thanks but that is wrong

sry

 Jul 21, 2022
 #3
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I am solving a problem online so i know it wrong

 Jul 21, 2022
 #4
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The way I see it is that cutting the resistance in half would double the current. 

You also double the voltage, so the current is doubled again.  So 4 • 100 mA  =  400 mA 

.

 Jul 22, 2022
 #5
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thxs

 Jul 22, 2022

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