what is the working principle of resistor?
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The main purpose of a resistor is to maintain specified values of voltage and current in an electronic circuit. A Resistor works on the principle of Ohm's law and the law states that the voltage across the terminals of a resistor is directly proportional to the current flowing through it. The unit of resistance is Ohm.
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Four resistors yields nine combinations. The advantage is that by using four resistors, the power dissipation capability has also increased by a factor of four, and the voltage withstand doubles. This is a useful trick when you want to keep all your resistors surface-mount types.
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The relationship between Potential Difference, Resistance, and Current is given by Ohm's Law, which states that: The potential difference (voltage) across an ideal conductor is proportional to the current through it. The constant of proportionality is called the "resistance", R.
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Thermistor Working Principle. The principle obeyed by the thermistor is its dependency on-resistance values on the change in temperature. The value of resistance can be measured by using an ohmmeter. These are connected in series with the battery and the meter.
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The equivalent resistance of resistors in series is: ... The single equivalent resistor has the same current through it as each resistor in the series circuit, and the potential difference across it equals the total potential difference across the whole chain of resistors.
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To calculate the total overall resistance of a number of resistors connected in this way you add up the individual resistances. This is done using the following formula: Rtotal = R1 + R2 +R3 and so on. Example: To calculate the total resistance for these three resistors in series.
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The fundamental relationship between voltage, current and resistance in an electrical or electronic circuit is called Ohm's Law. ... The electrons do not flow freely through the circuit as the material they move through creates a restriction to the electron flow. This restriction is called resistance.
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The simplest combinations of resistors are series and parallel connections (Figure 6.2. 1). In a series circuit, the output current of the first resistor flows into the input of the second resistor; therefore, the current is the same in each resistor.
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Voltage, Current and Resistance Summary The relationship between Voltage, Current and Resistance forms the basis of Ohm's law. In a linear circuit of fixed resistance, if we increase the voltage, the current goes up, and similarly, if we decrease the voltage, the current goes down.
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Resistors in Light Emitting Diode (LED) Circuits An LED (Light Emitting Diode) emits light when an electric current passes through it. ... The ballast resistor is used to limit the current through the LED and to prevent that it burns. If the voltage source is equal to the voltage drop of the LED, no resistor is required.
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To calculate voltage across a resistor in a series circuit, start by adding together all of the resistance values in the circuit. Then, divide the voltage across the circuit by the total resistance to find the current.
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Light dependent resistor works on the principle of variable resistance. whenever light falls on LDR, it changes its resistance according to light intensity. For example when light intensity is low, resistance of LDR will be high and similarly when light intensity is hig, LDR will offer a low resistance.
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Then to summarise, in a pure ohmic AC Resistance, the current and voltage are both said to be “in-phase” as there is no phase difference between them. The current flowing through the resistor is directly proportional to the voltage across it with this linear relationship in an AC circuit being called Impedance.
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['Potentiometer.', 'Rheostat.', 'Thermistor.', 'Magneto resistor.', 'Photoresistor.', 'Humistor.', 'Force sensitive resistor.']
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Moreso, in a purely resistive circuit, the phase angle between current and voltage is zero. Additionally, if we were to express the instantaneous current and instantaneous applied voltage of a typical purely resistive circuit, it will indicate that the supplied voltage and current are indeed in phase with each other.
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The working principle of an LDR is photoconductivity, that is nothing but an optical phenomenon. When the light is absorbed by the material then the conductivity of the material reduces. When the light falls on the LDR, then the electrons in the valence band of the material are eager to the conduction band.
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The functional principle of a resistive pressure transmitter is very simple. The pressure sensor converts the mechanical pressure value into a proportional electrical signal. The pressure sensor typically consists of a stable main body and a (thin) diaphragm.