## Solving a Simple Circuit of Three Elements

A simple circuit is solved and power absorbed or supplied by each element is determined. KCL as well as Ohm’s law are used in solving the circuit. positive sign convention is used in determining element powers. It is shown and discussed how a source, here current source, can be neither absorbing or supplying power. It is also mentioned that resistors are passive elements and always absorb power/energy.

## Circuit Containing Only Sources

We go through solving a circuit which only containes independent sources: two voltage sources and two current sources. KVL and KCL are used to determine voltages and currents.

## Superposition method – Circuit with two sources

Finding current by using superposition method. There are two independent sources, so we need to turn them off one by one and calculate their contributions.

## Solve By Source Definitions, KCL and KVL

A DC resistive circuit consisting of one voltage source and one current source and three resistors is solved using source definition, KCL and KVL.

## Problem 1-12: Using Voltage Sources to Determine Node Voltages

A three-node circuit is solved by using the voltage of voltage sources. The nodal analysis is not used since there are enough voltage sources to determine all node voltages.

## Problem 1-11: Solving a Circuit with Three Nodes by the Nodal Analysis

The circuit is solved using the Nodal Analysis. It has three nodes, two sources (one voltage, one current, both independent) and four resistors.

## Problem 1-10: Solving by Nodal Analysis – Circuit with Four Nodes

A circuit with four nodes solved using the Nodal Analysis. Step-by-step solution is provided. The circuit has three current sources and three resistors.