Currents are measured through wires, not in loops. There are three wires through which different currents are flowing (ignoring the wires with negligible resistance), so we measure three currents.kenok1216 said:
Because the currents going out rightwards from the top two wires return leftwards in the third wire.
Thankandrewkirk said:
Kirchhoff's voltage law, also known as Kirchhoff's second law, states that the sum of all voltage drops in a closed loop circuit must equal the sum of all voltage sources in that same loop. This law is based on the principle of conservation of energy.
In a circuit, batteries provide a constant voltage source, switches allow for control of the flow of current, and resistors create a drop in voltage. All of these components play a role in following Kirchhoff's voltage law.
A common problem encountered when applying Kirchhoff's voltage law is the presence of multiple loops in a circuit. This can make it difficult to accurately determine the voltage drops and sources in each loop.
To solve a Kirchhoff's voltage law problem, you must first label the voltage sources and resistors in the circuit. Then, you can use Kirchhoff's voltage law to write equations for each loop in the circuit. Finally, you can solve the equations simultaneously to find the voltage drops and sources in each loop.
Yes, Kirchhoff's voltage law can be applied to any type of circuit, including series and parallel circuits. It is a fundamental law in circuit analysis and is essential for understanding the behavior of electrical circuits.