An electrical circuit is a closed loop that allows electric current to flow. It typically consists of components such as wires, resistors, capacitors, and power sources like batteries. When the circuit is complete, electricity can travel through the components, enabling devices to function. Circuits can be classified as either series or parallel. In a series circuit, components are connected one after another, so the same current flows through each part. In a parallel circuit, components are connected across the same voltage source, allowing multiple paths for the current. This design affects how devices operate and share power.