Introduction to electricity units
Electricity current is created by the constant flow of electrons in a metal when a voltage potential applied across two points in the metal. When you switch on the lights of fan in your room, the electricity starts flowing and lights glow bright. This happens because the switch connects the lights to electricity circuit and electrons start flowing in the wires and powers the light. Do you waonder how electricity can create light in the bulbs and can also rotate the fan. How does this happen? The answer is that Electricity is a form of energy and it converts one energy type to another in different ways. For example, the light is one form of energy and fan rotation is another form.
We take all everyday things without even knowing how they work, but it took engineers and scientists a lot of efforts to understand and create the everyday gadgets for comforts. Do you also want to learn how things work? Let us begin learning and share what you already know.
Let us try to define a few things here which you will notice appearing repeatedly when you read about electricity.
Voltage or Volts-
Alessandro Giuseppe Antonio Anastasio Volta (Quite a name it is, Isn't it?) was an Italian scientist. He was born is 1745 (That's more than 250 years ago). This important unit 'Voltage' or simply 'Volt' of electricity is named after his contribution to the field of electricity. Imagine the overhead water tank at your home filled with water. When you open the water faucet, the water starts flowing. Way does the water flow from the tank to your faucet? This is because, the water in tank is situated at certain height from the ground, therefore, it has some amount of potential energy. When you open the water tap, the water from higher potential energy starts flowing to lower potential energy. That's a fundamental law of nature. The energy always flows naturally from higer potential to lower potential. Similarly, electricity also flows in the same way. As you apply higher voltage potantial between two points in a metal conductor (Wire), the current starts flowing from higher to lower potential. This potatial diffrence in electricity is called "Voltage" or "Volt".