Voltage, often referred to as electrical potential difference, is the force that pushes electric current through a conductor. Here’s a concise overview:

**Definition**:

- Voltage is the difference in electric potential energy between two points per unit electric charge. It’s essentially the “pressure” that pushes electric charges through a conductor.

**Measurement**:

- The unit of voltage is the volt, represented by the symbol “V.” It’s measured using a voltmeter.

**Types**:

**Direct Voltage (DC)**: Remains constant over time, typical of batteries.**Alternating Voltage (AC)**: Changes direction and amplitude over time, as seen in household electricity.

**Function**:

- Voltage drives electric current. The higher the voltage, the more “force” there is to move electric charges through a circuit.

**Sources**:

- Batteries, generators, and solar cells are examples of devices that produce voltage.

**Ohm’s Law**:

- Relates voltage (V), current (I), and resistance (R) in a circuit: (V = I \times R).

**Safety**:

- High voltage can be dangerous, as it can drive a high current through a conductor, including the human body. Safety precautions are essential when working with or near high-voltage systems.

**Applications**:

- Almost all electronic and electrical devices require a voltage source to operate, from tiny microchips to large industrial machines.

**Voltage Drop**:

- As current flows through a component or conductor, there may be a decrease in voltage, known as a voltage drop, which is typically due to resistance.

**Voltage vs. Current**:

- While voltage is the force that drives electric charge, current is the flow rate of the charge. Think of voltage as the water pressure in a hose, and current as the flow rate of the water.

In summary, voltage is a fundamental concept in electronics and electrical engineering, representing the potential difference that drives electric current through circuits.