Electric circuits are integral to understanding the behavior of electricity. They consist of interconnected components that allow the flow of electric current. The key concepts in electric circuits are voltage, current, and resistance.

Voltage is the driving force that pushes electric charges through a circuit. It is measured in volts (V) and can be thought of as the potential energy difference between two points in a circuit.

Current is the flow of electric charges, typically carried by electrons, through a conductive material. It is measured in amperes (A). In a closed circuit, the current remains constant as it flows through various components.

Resistance is the opposition to the flow of electric current in a circuit. It is measured in ohms (Ω) and depends on the material and dimensions of a component.

To illustrate these concepts, consider a simple circuit with a battery, a wire, and a resistor. The battery provides a voltage difference across the circuit, creating an electric field. The electric charges, represented by electrons, are then pushed by the field and flow through the wire. However, the resistor restricts the flow of electrons, creating resistance and reducing the current. This simple circuit, consisting of a voltage source, conductive wire, and resistive component, demonstrates the fundamental elements of an electric circuit.