Voltage

Voltage, also known as electric potential difference, is fundamental in electrical engineering and physics. It measures the potential energy difference between two points in an electric circuit. Voltage is the driving force that pushes electric charges (usually electrons) through a conductor, creating an electric current.
In an electrical circuit, Voltage is often represented by the symbol “V” and is measured in volts (V). One volt is defined as the potential difference across a conductor when one ampere of current flows through it, dissipating one watt of power.

Here are some key points about Voltage:

1. Voltage Difference: Voltage is always measured between two points in an electrical circuit. It indicates the potential energy difference between those points. One point is usually referred to as the reference or ground point (0 volts), and the other point’s Voltage is measured relative to this reference.
2. Electromotive Force (EMF): The Voltage across a power source (such as a battery or generator) is often referred to as electromotive force (EMF). EMF represents the energy per unit charge the source provides to move charges through the circuit.
3. Polarity: Voltage has a polarity, indicating the direction of the potential energy difference. When two points have different voltage polarities, it means that one point has a higher potential than the other. Conventionally, positive Voltage is considered to be at a higher potential, and negative Voltage is at a lower potential.
4. Voltage Drop: As electric charges flow through a circuit, they encounter resistance in the form of components like resistors, which can cause a voltage drop across those components. The voltage drop is the amount of Voltage consumed to overcome the resistance.
5. Kirchhoff’s Voltage Law: In a closed loop in an electrical circuit, the sum of the voltages across all elements (resistors, capacitors, etc.) is equal to the sum of the voltage sources (batteries, generators) in that loop. This principle is known as Kirchhoff’s Voltage Law (KVL).
6. Measuring Voltage: Voltage is typically measured using a voltmeter connected across the two points where the voltage difference needs to be determined.

Voltage is a crucial parameter in electrical and electronic systems, as it determines the behaviour of electric Current through components and devices. Proper understanding and control of Voltage are essential for the design, Operation, and safety of electrical circuits and devices.