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What is resistor used for?

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What Is the Function of a Resistor in an Electrical or Electronic Circuit? Working Principle, Applications, and Types Explained

Let's list them down. If something is missing, add it in the comments

Types of resistor


Voltage divider bias:

voltage divider for the transistor base



Current limiting:

current limiting to protect LED

Temp sensor: Temp. feedback.

temperature measurnment

Pressure sense:

pressure sensor

Current measurement:

Current measurnment

Voltage-dependent resistor: high voltage spike bustor.

Voltage dependant resisor to supress high voltage spike

Load:

Resistive load. E.g. heater

Filter:

RC Low Pass Filter

Pull-up/Pull-down resistor:

Pull down/Pull up resistor

Timing: 

Timing resistor for 555 IV

Voltage gain setting:

Gain setting in OP-Amp

Capacitor discharge:

Discharging capacitor

ESD discharge:

ESD protection resistor

Resistance measurement:

Unknown Resistance measurnment

Speed control:

Fan speed Control

FAQ Set:

Q1: What is a resistor?

A resistor is a passive electrical component that limits or regulates the flow of electric current in a circuit.

Q2: What is the primary function of a resistor?

Its main function is to control current, divide voltage, and protect sensitive components from excessive current.

Q3: How do resistors work in a circuit?

Resistors oppose the flow of electric current by converting electrical energy into heat, following Ohm’s Law (V = I × R).

Q4: What are the common applications of resistors?

  • Current limiting in LEDs and other components

  • Voltage division

  • Pull-up and pull-down circuits

  • Filtering and timing circuits

Q5: Are there different types of resistors?

Yes, common types include fixed resistors, variable resistors (potentiometers), thermistors, and photoresistors, each serving specific circuit functions.

Q6: Why are resistors important in electronic circuits?

They ensure proper circuit operation, prevent component damage, and help control voltage and current precisely for reliable performance.

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