What is Electricity? How To Calculate Electricity Cost?

1. Electricity

The phenomenon of the flow of electric charge through a conducting medium.
There are 2 types of charge, Positive and Negative.
Electric charge will flow from high potential to lower potential.

2. DC and AC Electrical Power

DC = Direct current is a current of electric charge that flows with a fixed value and direction, stored in a media like battery. used on all small electronic devices or gadgets.
AC = Alternating current is a current of electric charge that flows with a direction and quantity that periodically changes, generated from an electric alternator. used in large electronic devices such as refrigerators, ovens, water pumps, vacuum cleaners, etc.

3. Some of the Variables That Appear in this Phenomenon

Current (I) : The electric charge that flows on the conductor media in Amperes is measured by an Ammeter
Voltage (V) : The potential difference between the two poles, positive and negative, in Volts is measured with a Voltmeter
Resistant(R) : A load that slows the flow of electricity to be converted into other forms, light, sound, mechanical motion etc. Written in Ohms and measured with an Ohmmeter

4. From the above variables, the main formula for electricity is :

I = V / R
Written In the Units: Ampere = Volt / Ohm
Power(P) : The rate of electrical energy that flows in a conductor and is measured in Watts
P = V * I
Written In the Units: Watt = Volt * Ampere

5. Electrical Energy

The result of the conversion of electrical power into other forms of energy that can be used to illuminate, heat, move, and is measured in joules or kilowatt-hours (kWh)
kWh = P / 1000 * Time (Hours)
kWh = Watt / 1000 * Time (Hours)

6. Electricity Cost/Bill = kWh * Tariff

This electricity cost is calculated per unit kWh
Example:
Air conditioner 360 watts live within 1 hour 30 minutes per day, electricity tariff per kWh is 0.18 USD
Electricity Cost = 360 / 1000 * 1.5 * 0.18
Electricity Cost = 0.0972 USD
If this Air Conditioner live every day in a month, then:
Electricity Cost = 0.0972 * 30 = 2.916 USD