A resistor is a two-terminal electrical component that opposes the passage of an electric current. A resistor reduces current flow, adjusts signal levels, divides voltages, and terminates transmission lines. Resistors are used as part of motor control, power distribution systems, and as test loads for generators. Resistors are one of the most common elements you will see in any electrical network or circuit. In this article, we will look at 10 uses of resistors.
General uses of resistors
In-circuit function
The current flow in a circuit can be controlled by using resistors. This type of arrangement is generally useful in controlling circuit functions like changing the speed of the motor, musical tone pitch, the loudness of the amplifier, etc.
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 heaters, toasters, electric stove, microwaves, etc glows due to high temperatures. This is because the metal filament acts as a resistor, and as current passes through it, it generates heat.
In circuits containing LEDs and Transistors
Semiconductor devices like LEDs and transistors are sensitive to input current values. Hence, resistors are used in the circuit to regulate the input value of the current.
Temperature control
According to the joules law of heating, heat is directly proportional to resistance, the square of the current, and time[H = I2Rt]. 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 against short-circuiting. When the power exceeds the prescribed limit, the fuse burns and saves the other components in the circuit. When the power is below the limits, it functions as a normal resistor.
Temperature sensors
Thermistors are widely used in temperature sensors. These resistors change their resistance value based on the temperature. They are generally made up of metal oxides.
In lighting elements
Electric bulbs and other similar similar lighting elements use a resistive filament to generate light. Most of the lighting elements today are based on LEDs,
In power control circuit, filter circuit networks, and wave generators
As a shunt in Ammeters and multiplier in voltmeters
Uses of resistors based on the type
| Types of resistors | Uses |
| Fixed resistor | Used in an electronic circuit to keep the circuit in the circuit. Values are determined during the design phase of the circuit. |
| Variable resistor | Used for all forms of control, Like volume control on radios. Sliders in the audio mixer |
| Light-dependent resistor or photoresistor | Used in a number of sensor applications. |
| Varistor | Used for spike and surge protection.(to protect computers) |
| Wire wound resistor | They are widely used in TV sets, amplifiers, and other electronic circuits. (as they can limit current ads as well as used as a fuse.) |
| Fusible resistors | They are widely used in TV sets, amplifiers, and other electronic circuits. (as they can limit current ad well as used as a fuse) |
| Potentiometer | They are used as a voltage divider |
What are the uses of resistors in our daily lives?
- Most of the electrical circuits-based devices in our homes use resistors like remote control, mobile chargers, TV sets, hairdryers, etc.
- Electrical equipment like heater rods, kettles, iron, bulbs, etc. used resistor filaments.
See Also
10 Difference between motor and generator
20 Types of battery
5 Difference between earthing and grounding
