DC and AC Response of Resistor, Capacitor and Inductor

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 by 90 degree.
Capacitor circuit

Fig-1: Capacitor Circuit



DC response of capacitor

Fig-2: DC response of capacitor

AC response of capacitor

Fig-3: AC response of capacitor


Inductor

For inductor, initially when we applied a dc voltage across a inductor, voltage is maximum and current is minimum and with time voltage decreases exponentially and current increases exponentially. And voltage leads current by   90 degree or current lags voltage by 90 degree.
Inductor Circuit

Fig-4: Inductor Circuit



DC response of Inductor

Fig-5: DC response of Inductor

AC response of Inductor

Fig-6: AC response of Inductor
By knowing this fundamental properties , we can identify resistor , capacitor and inductor using ohm meter. 

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