How To Solve Circuit Problems

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First, look for portions of the circuit that have parallel elements.

Since the voltage across the parallel elements must be the same, replace the parallel resistors with an equivalent single resistor in series and draw a new schematic.

Let's use our circuit with the three 2000-ohm resistors as an example to demonstrate how a VIRP table is used.

To create the VIRP table, we first list our circuit elements, and total, in the rows of the table, then make columns for V, I, R, and P: Next, we fill in the information in the table that we know.

To find the equivalent resistance of any number of series resistors, we just add up their individual resistances: Note that because there is only a single current path, the same current must flow through each of the resistors.

A simple and straightforward method for analyzing circuits involves creating a VIRP table for each circuit you encounter.

Question: A 3.0-ohm resistor and a 6.0-ohm resistor are connected in series in an operating electric circuit.

If the current through the 3.0-ohm resistor is 4.0 amperes, what is the potential difference across the 6.0-ohm resistor?

Kirchhoff's Voltage Law (KVL) states that the sum of all the potential drops in any closed loop of a circuit has to equal zero.

More simply, KVL is a method of applying the law of conservation of energy to a circuit.


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