Electrical current is the flow of electric charge through a conductor, such as a wire. It is measured in amperes (A). There are two types of current: direct current (DC) and alternating current (AC). In DC, the flow of charge is continuous and always in the same direction, while in AC, the flow changes direction periodically.

To understand the relationship between current and voltage, let's consider an example. Imagine a simple circuit where a battery is connected to a light bulb using a wire. The battery creates a voltage difference across the circuit, which causes a current to flow through the wire, powering the light bulb. The amount of current flowing depends on the voltage and the resistance in the circuit, as described by Ohm's Law.

In terms of measurement, current can be measured using an ammeter, which is connected in series to the circuit. When measuring current, it is essential to ensure that the ammeter is connected correctly and that the circuit is not interrupted.

The concept of current is crucial in various applications, such as electronics, power systems, and electrical appliances. It helps us understand how electricity is distributed and utilized in different devices and circuits.