Can any one tell me what is the use of measuring impedance in a circuit or a component?What actually this parameter represents?
Then what exactly it represents in the circuit?Why does a plumber measure the size of a pipe before he repairs it?
Why does a grocer measure the weight of a bag of sugar before he sells it?
Why do you measure the time of day when you are intending to catch a bus?
Does this mean that circuits powered with ac only will have impedence?hi,
The impedance of a circuit is the 'resistance' of the circuit to a Alternating Current input, its a frequency dependent impedance.
The impedance can be due to the capacitive reactance of the circuit, inductive reactance or a combination of both.
XC = 1/[ 2* pi *F * C] ... XL = 2 *pi *F *L
The total impedance value will have a 'real' part and 'imaginary' part component.
Google for these terms.
E
All circuits that actually work (except maybe superconductors) have impedance. Sometimes it is only the real part and sometimes it includes the imaginary parts. Otherwise, they just short everything out or blow a fuse. Even a circuit driven with DC will have an impedance with real and imaginary parts at the moment of start-up. That's because parasitic inductance and capacitance will see the application of DC voltage as 1/2 of a fast pulse. Only after the time of first transient response passes will the circuit behavior resolve to only the real part of the impedance (resistance). Impedance is just a bigger word for resistance that reminds you to, "Pay attention to the imaginary part of the response and what frequency range you're working in".Does this mean that circuits powered with ac only will have impedance?
It represents a constraint on the relationship between the voltage across a component and the current through that component. In general, electronic circuits are designed to create desired relationships between voltages and/or currents (and often with non-electronic parameters such as light, torque, heat, etc) within the circuit and the impedances are one of the "tools" that we use to make this happen or at least to predict what will happen.Can any one tell me what is the use of measuring impedance in a circuit or a component?What actually this parameter represents?
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