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A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.

There is a large number of different types of resistor that can be bought and used. The properties of these different resistors vary, and it helps to obtain the right type of resistor for any given design to ensure that the best performance is obtained.

Uses

Voltage drop

When resistors are connected in series, the voltage drops across each resistor to ensure that the device has the desired potential values. This becomes critical when the input potential is very high compared to the working potential of the device.

Heating applications

You might have noticed that the filament of devices like heater, toaster, electric stove, microwaves, etc glows due to high temperature. This is because the metal filament acts as a resistor, and as current passes through it, it generates heat.

Temperature control

According to the joules law of heating, heat is directly proportional to resistance, the square of the current, and time. This can be used to control the temperature by varying current and time factors.

For protection as fusible resistors

Fusible resistors are used to protect from short-circuiting. When the power exceeds the prescribed limit, then the fuse burns and saves the other components in the circuit. When the power is below the limits, it functions as a normal resistor.

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