# Electric Circuits

1. Dec 5, 2004

### soccerjayl

In electric circuits, you know how parallel voltage is the same throughout, but series voltage adds up to the supply.

What if there is a battery connected in series to two resistors. However, what if one of the resistors continues on parallel. How, then would u find the volts of the solo one in series.

Also, what part does an open circuit play in a parallel circuit. In other words, if the first two resistors connected parallel are closed, but the third is open, what is the result?

2. Dec 5, 2004

### Integral

Staff Emeritus
I believe that you are asking about a series parallel circuit. These consist of both series and parallel elements. The general scheme is to simplify the circuit by computing the resistance contribution of each simpler portion. When elements are connected in parallel you can compute a single resistance, which will be in series with other elements.

The exact steps needed to simplify a circuit are determined by the circuit so it is difficult to specify a sequence. Start by combining all obvious sections, a pair of resistors in parallel, a leg of series resistors. Once the obvious simplifications are made, redraw the circuit with the simplified representations. Repeat. Repeat the process until you arrive at a single total resistance.

Once you have reduced a parallel set to a single resistance its voltage drop can be computed as if it were a single series resistor.

The result of the single open resistor in a 3 resistor parallel network would be that you have 2 resistor in parallel, the 3rd would not be in the circuit.

Last edited: Dec 5, 2004