Define voltage, current, and resistance.

Voltage:

Voltage, often referred to as electric potential difference, is the measure of the potential energy difference between two points in an electrical circuit. It is the driving force that pushes electric charges (electrons) to move from one point to another. Voltage is measured in volts (V) and is typically represented by the symbol "V." Higher voltage indicates a greater potential energy difference and can lead to a stronger flow of electric current.

Current:

Electric current is the flow of electric charge through a conductor, such as a wire. It is the rate at which electric charges (usually electrons) move past a given point. Current is measured in amperes (A), and the symbol used for current is "I." There are two types of electric current: direct current (DC), where the flow of charges is constant in one direction, and alternating current (AC), where the flow of charges periodically reverses direction.

Resistance:

Resistance is the opposition that a material or component offers to the flow of electric current. It is caused by factors such as the material's properties, the length and cross-sectional area of the conductor, and the temperature. Resistance is measured in ohms (Ω), and the symbol for resistance is "R." Ohm's Law relates voltage (V), current (I), and resistance (R) through the equation: V = I * R. In other words, the voltage across a resistor is directly proportional to the current flowing through it and inversely proportional to its resistance.

These three concepts are interconnected and form the basis for understanding the behavior of electrical circuits and devices. Ohm's Law and other fundamental principles of electronics help engineers and scientists design and analyze circuits to achieve desired outcomes in various applications.