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Copper is one of the best conductors of electricity. It allows electrons to flow freely, which is why it is widely used for electrical wiring. Copper has a low resistivity, making it ideal for efficient energy transmission.

The SI unit of electric charge is the Coulomb (C). It represents the amount of charge transported by a current of one ampere in one second. The Coulomb is a fundamental unit in electrical engineering.

The formula P=V×I calculates electrical power, where power is measured in watts, voltage in volts, and current in amperes. This is used to determine how much energy is consumed or supplied in a circuit.

A circuit breaker automatically interrupts the flow of current in a circuit when it detects an overload or short circuit. This protects electrical devices from damage by preventing excessive current from flowing through the circuit.

A capacitor stores electrical energy in an electric field between two conductive plates. It can discharge this energy when needed, making it useful in applications such as smoothing power supplies and filtering signals.