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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 50 volts through this wire and measure 300 milliamps of current. If I cut the wire in half and pass 300 volts through it, how many milliamps of current will I measure?

 Aug 12, 2021
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I = V/R

Initially    .300 = 50/R     R = 166.667 ohms      Cutting the wire in half also cuts R in half to 83,33 ohms

 

 

I = 300/83.33 = 3.6 amps     = 3600 mAmps

 Aug 12, 2021

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