Electricity is based on three fundamental concepts: current, voltage, and resistance. Current is the flow of electric charge, usually carried by electrons, through a conductor like a wire. It is measured in amperes (A) and flows from the positive terminal to the negative terminal of a power source. Voltage is the electrical potential difference between two points in a circuit, which acts as the driving force that pushes the current through the conductor. It is measured in volts (V). Higher voltage increases the flow of current, assuming the resistance remains constant. Resistance is the opposition to the flow of electric current within a conductor and is measured in ohms (Ω). Materials with higher resistance slow down the flow of current, while those with low resistance allow it to pass more easily. These three concepts are linked by Ohm’s Law, which states that the current flowing through a conductor is directly proportional to the voltage across it and inversely proportional to the resistance. The relationship is expressed as V = I × R, where V is voltage, I is current, and R is resistance. Understanding these basic concepts is essential for working with electrical circuits and systems.