Example: You have a 3v supply that goes through a 4 ohm resistor. The amperage before flowing through the resistor is 0.75, so what is the voltage on the other side of the resistor?
Supply(3v)N---------------Galvanometer… P---------------------------------------…
(A) Are the given parts correct?
(B) What's the new voltage?
Please help!
Supply(3v)N---------------Galvanometer… P---------------------------------------…
(A) Are the given parts correct?
(B) What's the new voltage?
Please help!
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The voltage after the resistor is 3-.75(3)=3-2.25=.75 volts. The notion of "voltage after the resistor" is not quite correct. The voltage drop across a resistor is always IR, so if a source (of 3 volts) is connected to a resistor (say 3 ohms) that (somehow) has a current (say .75 amps) through it we can determine the voltage at the low side of the resistor. It is given by Vsource-IR, which is what I wrote in the first sentence.