الحرارة الكهربية - الكهرباء في المنزل .. الآلات التي نستخدمها كل يوم وكيف تؤدي عملها

Electric Heat - Electricity in the Home .. The Machines We Use Every Day and How They Work

Electricity in the Home:

Electricity performs various tasks in the modern home: it cooks food, washes clothes, rings bells and provides us with lighting, runs your electric train and performs countless other services. These services seem completely different from one another. Each of these inventions is different from other inventions. The baking oven does not resemble the electric iron at all, and the electric bell is far from similar to that, it will become clear to you. If you study it thoroughly - the electric train. Although all these electrical inventions that you see in your home perform three types of work:
Some of them generate heat.
Some of them generate light.
And some of them cause movement.

Electric Heat:

Each electrical invention performs its work when an electric current flows through it. For example, if you want to use an electric iron, you insert the plug connected to it into a socket fixed in the wall. When you do this, it is as if you are actually connecting two wires in the iron to two other wires coming from the power plant, and the electric current passes through one of these wires, flows inside the iron, and then returns again to the power plant. But how does this process cause the iron to heat up?

Electricity flows inside the iron, through a specific type of wire. This wire is made of a non-rusting metal called nichrome. One of the properties of this metal - in addition to not rusting - is that it heats up very much when electricity flows through it. When this wire heats up, it heats the rest of the parts of the iron, which in turn heats the clothes we want to iron.

You find these nichrome wires in all appliances that use electricity to generate heat. You find them in the cake mold, in the toaster, in the electric filter, in the wire mesh that makes pancakes, in ovens, in kitchen stoves, in the soldering iron and the hair straightener. The shape of the nichrome wire varies, sometimes it looks like a ribbon, and sometimes it is round, but it always performs the same function: it heats up if an electric current passes through it. The nichrome wire is completely covered in most electric heating devices, in order to protect the wire itself and to protect you at the same time. Covering food is necessary in the kitchen stove, for example, to protect it from boiling. For this reason, the nichrome wire in kitchen stoves is surrounded by a metal tube that wraps around it. As for the toaster, or in the heating chamber, you can see the nichrome wire glowing because these two devices are designed in such a way that it is difficult for you to reach these wires and damage them. Some bread toasting machines can stop working automatically when the bread is toasted, and there are other machines that stop the flow of electricity when they are finished working. All of these machines contain special small switches, and we will explain the work of these switches in a special chapter later.