# Kirchhoff s current law

Kirchhoff's loop rule Video transcript - [Voiceover] Up to now we've talked about resistors and capacitors and other components, and we've connected them up and learned about Ohm's law, for resistors, and we've also learned some things about series resistors, like we show here. Solving for all values of voltage and current in this circuit: At this point, we know the value of each branch current and of the total current in the circuit. Taking a look at the currents at each wire junction point node in the circuit, we should be able to see something else: From the right and from the bottom, we have two currents entering the wire connection labeled as node 3.

## Kirchhoff's Current Law (KCL)- Explained

To the left, we have a single current exiting the node equal in magnitude to the sum of the two currents entering. To refer to the plumbing analogy: Mathematically, we can express this general relationship as such: Taking our example node number 3we can determine the magnitude of the current exiting from the left by setting up a KCL equation with that current as the unknown value: The negative - sign on the value of 5 milliamps tells us that the current is exiting the node, as opposed to the 2 milliamp and 3 milliamp currents, which must both be positive and therefore entering the node.

Whether negative or positive denotes current entering or exiting is entirely arbitrary, so long as they are opposite signs for opposite directions and we stay consistent in our notation, KCL will work.Current to Voltage Converter. A current to voltage converter will produce a voltage proportional to the given current. This circuit is required if your measuring instrument is capable only of measuring voltages and you need to measure the current output.

This problem introduces Kirchhoff’s two rules for circuits: Kirchhoff’s loop rule: The sum of the voltage changes across the circuit elements forming any closed loop is zero.; Kirchhoff’s junction rule: The algebraic sum of the currents into (or out of) any junction in the circuit is zero.; The figure shows a circuit that illustrates the concept of loops, . Kirchhoff’s Voltage Law (KVL) is Kirchhoff’s second law that deals with the conservation of energy around a closed circuit path. Gustav Kirchhoff’s Voltage Law is the second of his fundamental laws we can use for circuit analysis.

Kirchhoff's Current Law (KCL) Kirchhoff's Current Law is a statement of conservation of charge: what goes in must come out at every junction (node) on a circuit network.