Hence, the speed of the fan can be controlled by using the potentiometer. If we connect the resistors of known resistance in series, then the electric current in the circuit can be calculated by measuring the voltage drop across the resistor; this resistor is known as a shunt resistor, and they usually have high power ratings and low resistance value. The temperature sensors are used to measure the degree of hotness or the coolness of both living and non-living things.
Thermistors are used in temperature sensors because they can easily detect small changes in the temperature as the change in the temperature of the body is directly proportional to the change in the resistance of the diode. If the temperature of the body is low, then the resistance will also become low, but if the temperature of the body is high, then the resistance will also be high. The resistance is thus detected and measured by the temperature sensor and is converted into electrical signals, which give us readable units of temperature like Fahrenheit, Celsius, etc.
Many electrical devices in which current controlling is required such as changing the musical pitch of the tone, loudness of an amplifier, speed of the electric motors, uses variable resistors in them. Variable resistors allow us to change the amount of current flow in these devices by changing the resistance by simply sliding or rotating the knob. Resistors are used in electrical circuits as voltage dividers.
A voltage divider divides the source voltage into different parts of the electric circuits and gives the desired operating voltage at the output or the load terminal. The simplest voltage dividing circuit consists of two resistors R1 and R2 connected in series that give lesser output voltage Vo than the source voltage Vs as per the requirement at the output terminal. Where Vo is the output voltage, Vs is the source voltage, R1 and R2 are the resistance of the resistors connected in series.
Heating appliances like heaters, kettles, toasters, and electric ovens, use resistors in them. Resistors turn the electric current into heat and slowly dissipate this heat to make the appliances warm. The filament in the light bulb used in these heat appliances also behaves as a resistor as it reduces the current and heats up the filament wire until it glows. The heat dissipated by the resistors is measured in terms of heating power Watts , which is given by,.
Where P is the heating power watts , I is the electric current in the circuit amps , and R is the resistance offered by the resistor ohms. Transistors and LEDs are very sensitive to the electric current. The overflow of electric current can disrupt the sensitive components of these devices, and very little current in the circuit can affect their proper functioning.
A resistor of the fixed values is connected in series with the led as they allow only the defined value of the current range to pass through these devices. Resistors that are used in LEDs are often known as ballast resistors; ballast resistors minimize the current flow in LEDs and protect them from getting burnt. Resistors are used in various devices like electronic sirens, light flashers, and various other similar devices that consist of timing circuits.
The timing circuit consists of either resistors and capacitors combination RC or resistors and inductor combination RL that are connected in series or in parallel with each other. Capacitors and inductors are used to store the energy supplied by the voltage source; capacitors retard the change in the voltage, while inductors retard the change in the electric current. The ability of the capacitor and inductor to charge themselves depends upon the amount of resistance used in the circuit, they take a long time to charge up if the resistance is high or vice-versa.
The time value of the circuit can be obtained by multiplying the value of resistance in terms of ohms by the value of the capacitor in terms of farads or inductor in terms of henry. The time period of the circuit can be increased by increasing the resistance in the circuit as the electric current in the circuit gets slow down. Time Delay Circuit with Resistors and Capacitors. Parallel circuits of resistors are preferred over the series circuits in the lighting systems in homes because if we connect resistors in the series, then every bulb of the home gets switched off if we turn off only one light bulb.
Moreover, the voltage is not the same across all the loads in the series, a larger number of loads means less voltage per load, and the farther away load from the source will get the least voltage. A Blower motor is used to run a fan that maintains the air ventilation system of the cars.
The blower resistor is connected in series to the blower fan so that the current passing through the blower motor can be controlled by changing the resistance of the blower motor. Blower resistors consist of several resistors, which are used to control the speed of the fan as when we change the resistance the current passing through the motor reduces, which lowers the fan speed.
Various designs are used for the construction of blower resistors that involve different sized wire-wound resistors are placed in series for controlling each fan speed, and in other designs, integrated circuits are mounted on the PCB printed circuit boards. Privacy Policy.
Password recovery. Home Physics 10 Uses of Resistors. General uses of resistors In-circuit function The current flow in a circuit can be controlled by using resistors. Voltage drop When resistors are connected in series, the voltage drops across each resistor to ensure that the device has the desired potential values. Heating applications You might have noticed that the filament of devices like heater, toaster, electric stove, microwaves, etc glows due to high temperature.
A simple electrical circuit with resistors and LED bulbs. For protection as fusible resistors Fusible resistors are used to protect from short-circuiting.
In temperature sensors Thermistors are widely used in temperature sensors. In lighting elements Electric bulbs and other similar similar lighting elements use a resistive filament to generate light. Image by Josch13 from Pixabay 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 right condition 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 audio mixer Light-dependent resistor or photoresistor Used in a number of sensor applications.
Varistor Used for spike and surge protection. Fusible resistors They are widely used in TV sets, amplifiers, and other electronic circuits. 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, kettle, iron, bulb, etc. See Also 10 Difference between motor and generator 20 Types of battery 5 Difference between earthing and grounding Share this: Twitter Facebook. Recent Posts. Azeotropes admin - November 4, 0. Azeotropes are mixtures of two or more liquids whose proportions cannot be changed by simple distillation.
Resistance is one of the key factors used in electricla and electronic circuits. Resistance is the proprty of materials to resist the flow of electricity, and it is governed by Ohm's Law.
Read more about Resistance. There are two main circuit symbols used for resistors. The oldest one is still widely used in North America and consists of a jagged line representing the wire used in a resistor.
The other resistor circuit symbol is a small rectangle, and this is often termed the international resistor symbol and it is more widely used in Europe and Asia. The Omega sign is often omitted and the decimal point replaced by the multipler: e. There are many different types of resistor.
Some are for special applications like being used as variable resistors, and others are used for surge limitation whilst others provide a variable resistance with temperature. All of these characteristics can be used. However for fixed resistors there are different characteristics that need to be taken into account.
Even though the actual resistance of the component is of paramount importance, other characteristics also need to be taken into consideration. Power dissipation, noise, inductance, thermal stability and a number of other characteristics may all have a bearing on the operation of the circuit in which the resistor is used. Different materials and different structures within the resistor can have a major impact.
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