How Can You Realize Electricity?

We cannot see electricity but we can measure it. Measuring electricity mainly mean to measure electrical parameters like current, voltage, power and energy values. We are familiar with these terms but we should clearly understand the physical meaning of them, let us clear this:
Physically the current flow in wire is similar to the water flow in a pipe as the amount of water flow is depend on the amount of pressure applied on the pipe and the diameter of the pipe, the current flow in wire depend on the voltage difference that making the current pass and the diameter of the wire. Also Any thing in the pipe that slow the water flow like smaller pipe or fins inside it is refer in the electrical term to the resistance of the wire .

What is the meaning of the voltage?
The voltage is the force that push electrons to pass throw a circuit (current), so a 100 v power supply will apply greater push of electrons in a circuit than a 50 v power supply in the same circuit . Voltage is measured in Volt (V).

What is the meaning of the current?
The current is the flow of electrons between two points having voltage difference; also you should note that as the diameter of the wire increase the amount of electric current (number of electrons) that can flow increased. The current is measured in Amps (A).

What is the meaning resistance?
The resistance is the force that impede and slows the flow of electrons in wires and it depends on the metal of the wire "copper, aluminum, silver…" and its diameter. Resistance is measured in ohms (Ω).
What is the meaning of the electrical load?
The electrical load is any device placed in an electrical circuit and consumed the electricity to do work, for example the light bulb that convert electrical energy to light and T.V and much more, every load has a resistance and comply with ohm’s law.

What is ohm’s law?
This law is discovered by German physicist called George Ohm, the law states that the current flows throw a material (metal) is proportional to the voltage so if you doubled the voltage, the current also doubled and if you reduce the voltage by a half, the current will reduce to the half also and in the two cases the resistance remain the same.
Ohm’s law formula is:  
Voltage = current x resistance.
V = I x R.
What is the meaning of electrical power?
The electrical power is the rate at which the electricity is consumed or produced, if we again using the water analogy, power is the combination of voltage (water pressure) and the rate of flow (current) and the result is the ability to do work. Simply electrical power is the amount of electricity required to operate a load for one second and it is measured in watts (W).
Electrical Power Formula is:
Power = voltage x current
P= V x I.

What is the meaning of electrical energy?
Electrical energy is the amount of power that consumed or generated in one hour, if we use the water analogy, it will be the amount of water falling throw the pipe over a period of time. So to indicate the amount of energy consumed by a device you must know how long (time) the device consume electricity measured in (hours) and the rate of energy consumption measured in (watt).electrical energy measured in "kwh" (kilo watt hour).
Electrical energy formula is:
Energy (E) = Power (P) x Time (T)
E = P x T.
Note that one watt-hour is a very small amount of electrical energy so usually electrical utilities measure the energy in "kilowatt-hours" which equal to "1000 watt-hours" when billing customers.

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