other fixed resistors is made by using the characteristics of some materials that hinder the current, and it is a relatively basic and commonly used electronic component. So what does it do in the circuit?

1. Limit current flow

In order to make the current through the electrical appliance does not exceed the rated value or the specified value required for actual work to ensure the normal operation of the electrical appliance, a variable resistor can usually be connected in series in the circuit. When the size of this resistance is changed, the size of the current also changes. We call this kind of resistance that can limit the size of the current as current limiting resistance. For example, in the circuit of the dimmable table lamp, in order to control the brightness of the lamp, a current limiting resistor can also be accessed in the circuit, and the size of the current in the circuit can be controlled by adjusting the size of the access resistor, so as to control the brightness of the lamp.

2. Shunt

When several electrical appliances with different rated currents need to be connected at the same time on the dry road of the circuit, a resistor can be connected in parallel at both ends of the electrical appliance with smaller rated current, and the role of this resistor is "shunt". For example, there are two bulbs A and B, the rated current is 0.2A and 0.4A respectively, obviously the two bulbs can not be directly connected to the same circuit in series. However, if we parallel a suitable shunt resistor at both ends of the A lamp, when the switch S is closed, both A and B lamps can work normally.

3. Partial pressure

General electrical appliances are marked with the rated voltage value, if the power supply is higher than the rated voltage of the electrical appliance, the electrical appliance can not be directly connected to the power supply. In this case, the electrical appliance can be connected with a suitable resistance value in series, so that it can share a part of the voltage, and the electrical appliance can work at the rated voltage. We call such a resistor a partial voltage resistor.

4. Convert electrical energy into internal energy

When a current passes through a resistor, it converts all (or part) of the electrical energy into internal energy. Electrical appliances used to convert electrical energy into internal energy are called electric heaters. Such as electric iron, electric stove, rice cooker, heater and so on.

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