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Kirchhoff's first law, also known as Kirchoff's current law (KCL), states that at any node of the circuit, the sum of the currents flowing into the node is equal to the sum of current flowing out of the node.

Kirchhoff's second law, also known as Kirchhoff's voltage law (KVL), states that the sum of the voltage in a closed loop is always equal to zero.

**Click **on 'New circuit' to change the circuit.

**Click **on the checkboxes to select a circuit with or without current source.

**Click** on 'Change values' to set new component's value.

- To solve a circuit using the Kirchhoff's circuit laws
- To distinguish a voltage source from a current source.