Quantity of electricity refers to the amount of electric charge that flows through a circuit or a conductor over a certain period of time. Electric charge is the fundamental property of matter that is responsible for electrical phenomena. The unit of electric charge is the coulomb (C).
The quantity of electricity (Q) can be calculated using the formula:
Q = I * t
Where:
Q is the quantity of electricity in coulombs (C).
I is the electric current in amperes (A) flowing through the circuit.
t is the time in seconds (s) during which the current flows.
For example, if a current of 2 amperes flows through a circuit for 5 seconds, the quantity of electricity that has passed through the circuit is:
Q = 2 A * 5 s = 10 C
It's important to note that the quantity of electricity is different from electric energy. Electric energy (E) is the work done by the electric current and is usually measured in joules (J) or kilowatt-hours (kWh). Electric energy is related to the quantity of electricity by the equation:
E = Q * V
Where:
E is the electric energy in joules (J) or kilowatt-hours (kWh).
Q is the quantity of electricity in coulombs (C).
V is the voltage in volts (V) across which the charge flows.
Understanding the concepts of quantity of electricity and electric energy is fundamental in various areas of electrical engineering and physics, as they play a crucial role in describing the behavior of electrical systems, circuits, and devices.