What are the advantages and disadvantages of the incandescent bulb?

What are the advantages and disadvantages of the incandescent bulb?

Reading time: <1 minut The incandescent bulb consists of a filament (very thin wire) enclosed in a vacuum glass vessel (from which, to avoid "oxidation" of the filament, air was removed). When I apply an electrical voltage to the ends of the filament, it heats up until it becomes incandescent (emits light).

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What is the primary coil and what is the secondary coil on a transformer?

What is the primary coil and what is the secondary coil on a transformer?

Reading time: 2 minute The presented article refers to the grid transformers with sheet metal core. The vast majority of such transformers are of the "descending" type, ie they have a coil connected to 220V (which is why it is called the primary coil) and output lower voltages in all other coils (called secondary coils).

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