* Voltage (V): This is the electrical potential difference between two points. It represents the "push" or "force" that drives electric current. Think of it like water pressure in a pipe.

* Current (I): This is the rate of flow of electric charge. It is measured in amperes (A) and represents the amount of charge passing a point in a circuit per unit of time. Imagine it as the amount of water flowing through the pipe.

* Resistance (R): This is the opposition to the flow of electric current. It is measured in ohms (Ω). Think of it as the size of the pipe. A larger resistance means less current can flow for a given voltage.

These three quantities are related by Ohm's Law:

V = I * R

This means:

* Voltage (V) is directly proportional to Current (I) when Resistance (R) is constant.

* Voltage (V) is directly proportional to Resistance (R) when Current (I) is constant.

* Current (I) is inversely proportional to Resistance (R) when Voltage (V) is constant.

Understanding these three basic quantities and their relationships is essential for understanding electricity and electronics.