A resistor is a current limiting element. When a resistor is connected to a circuit, the resistance of the resistor is fixed, usually with two pins, and it can limit the current passing through the branch it is connected to. A resistor whose resistance cannot be changed is called a fixed resistor, and a resistor whose resistance can be changed is called a potentiometer or a variable resistor. The main physical characteristic of a resistor is that it converts electrical energy into heat energy. It can also be said that it is an energy-consuming element, and internal energy is generated when current passes through it. Resistors usually play the role of voltage division and current division in circuits.

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