What kind of component is a resistor

Resistors are generally referred to as resistors in daily life. It is a current limiting component that connects a resistor 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 value cannot be changed is called a fixed resistor. Variable resistance is called a potentiometer or variable resistor. The ideal resistor is linear, meaning that the instantaneous current passing through the resistor is proportional to the applied instantaneous voltage. Variable resistor used for voltage division. Press one to two movable metal contacts tightly onto the exposed resistor. The contact position determines the resistance value between either end of the resistor and the contact.

There is a definite functional relationship between terminal voltage and current, which is a two terminal device that reflects the ability to convert electrical energy into other forms. It is represented by the letter R and is measured in ohms Ω. Actual devices such as light bulbs, heating wires, resistors, etc. can all be represented as resistor components.

The resistance value of a resistive element is generally related to temperature, material, length, and cross-sectional area. The physical quantity that measures the degree to which resistance is affected by temperature is the temperature coefficient, which is defined as the percentage change in resistance value for every 1 ℃ increase in temperature. The main physical characteristic of resistance is to convert electrical energy into thermal energy, which can also be said to be an energy consuming component. When current passes through it, internal energy is generated. Resistors usually play a role in dividing and diverting voltage in circuits. For signals, both AC and DC signals can pass through resistors.

What is the role of resistance in a series circuit

The voltage divider function of resistance:

Resistors such as 100 ohms, 1k ohms, 470 ohms, etc. all have voltage divider functions. Because a voltage ｄｒｏｐ occurs when current flows through a resistor, two resistors can be connected in series for voltage division. In order to obtain different voltages R1 and R2, different resistance values can be selected in the following circuit diagram. We use Vmeas=Vref (R2/(R2+R1)), which is the voltage value between two resistors connected in series.