Kirchhoff's circuit laws are two equalities that deal with the current and potential difference (commonly known as voltage) in electrical circuits.
Kirchhoff’s Junction Rule and the Conservation of Electric Charge
Kirchhoff's second law or loop rule states that the directed sum of the potential differences (voltages) around any closed loop is zero.
Resistors in series
Kirchhoff’s Loop Rule
Kirchhoff's first law or Kirchhoff's junction rule (or nodal rule) states that, for any node (junction) in an electrical circuit, the sum of currents flowing into that node is equal to the sum of currents flowing out of that node; or equivalently:
The algebraic sum of currents in a network of conductors meeting at a point is zero.
Resistors in parallel
Circuit Construction Kit
Do you like Circuit Construction Kit: DC, but want to use only in-line ammeters? This is the sim for you! Experiment with an electronics kit. Build circuits with batteries, resistors, light bulbs, and switches. Determine if everyday objects are conductors or insulators, and take measurements with a lifelike ammeter and voltmeter. View the circuit as a schematic diagram, or switch to a lifelike view.