When you have a 3 resistors in parallel and you have 120Vrms@ 60 Hz
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When you have a 3 resistors in parallel and you have 120Vrms@ 60 Hz

[From: ] [author: ] [Date: 11-12-05] [Hit: ]
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Do you have to do something with the 120Vrms@ 60 Hz because i know all the resistors suppose to have the same voltage so i could just find the missing values, but i'm confuse whether or not the voltage will be 120 because it said 120Vrms@60 Hz what does that mean?

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120 V rms, 60 Hz AC is the equivalent of 120 V DC (or battery voltage).

In a parallel circuit, each branch of resistors are connected across the 120 Vrms AC source. Each resistor "feels" 120 volts across it. The AC current in each resistor branch is I = V / R, where I is the branch current, V is the 120 V AC, and R is the branch resistor resistance. The total circuit current is the "sum" of each branch current; as in I1 + I2 + I3 ...

Total parallel circuit resistance is:

Rt = 1 / (1/R1 + 1/R2 + 1R3)

Total circuit current is: 120 V AC / Rt

See: Ohm's Law for Electrical Circuits
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