Electronics

 Electronics

Learn electronics, understand electronics and apply electronics in your daily life.


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DC and AC Response of Resistor, Capacitor and Inductor

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DC and AC Response  Resistor, Capacitor and Inductor In our previous section, we discussed the fundamentals of resistor, capacitor and inductor. We also discussed how we measured the resistance of a resistor. Today we will discuss about the identification of resistor, capacitor and inductor using a ohm meter. We know that ohm meter is used to measure the resistance of a resistor. We can also use ohm meter to identify capacitor and inductor. To understand it , we have to understand the AC And DC response of a resistor, capacitor and inductor. Resistor For resistor, DC current and voltage are constant with time. AC current and voltage are also constant and in phase with each other. Capacitor For capacitor, initially when we applied a dc voltage across a capacitor, current is maximum and voltage is minimum and with time current decreases exponentially and voltage increases exponentially. And current leads volgate by   90 degree or voltage lags current b...
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RC Circuit acts as a Resistor and Capacitor and Common Applications

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RC Circuit: When a resistor and a capacitor are connected in series with a ac voltage source, then it is called series RC circuit. It is a first order differential circuit.  In this circuit, the values of R , C and applied voltage are fixed. By varying the frequency of the applied voltage, this RC circuit acts as a resistive circuit and capacitive circuit. Fig : - RC circuit Total impedance of the circuit  Z  = sqr(R 2  + X c 2 ) From the above equation we see that , total impedance of a RC circuit consist of resistance and capacitive reactance. The total impedance changes with frequency. RC circuit acting as a capacitor:  As we know that, Capacitive reactance, X c = 1 / 2πfC,  that is capacitive reactance decrease with increasing signal frequency. So at low frequency, the RC circuit acts as a capacitive circuit, because at low frequency, capacitive reactance will be much much greater than the resistance. And the circuit w...
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Photo diode Working Principle, Characteristics and Applications

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  Photodiode Working Principle, Characteristics and Applications A photodiode is a   PN-junction diode   that consumes light energy to produce electric current. Sometimes it is also called as photo-detector, a light detector, and photo-sensor. These diodes are particularly designed to work in reverse bias condition, it means that the P-side of the photodiode is associated with the negative terminal of the battery and n-side is connected to the positive terminal of the battery. This diode is very complex to light so when light falls on the diode it easily changes light into electric current. The solar cell is also branded as large area photodiode because it   converts solar energy into electric energy . Though, solar cell works only in bright light. What is a Photodiode? A photodiode is one type of light detector, used to convert the light into current or voltage based on the mode of operation of the device. It comprises of optical filters, built-in lenses and also su...
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