Question

Q. 17) What is meant by the term impedence?
The total impedance of a circuit decreases when a capacitor
is added in series with L and R. Explain why.​

Answer 1

Answer:

For an LR circuit, the impedance, Z LR = R 2 + X L 2 , where XL is the reactance of the inductor. When a capacitor of capacitance C is added in series with L and R, the impedance, ... The decrease in net reactance decreases the total impedance ( Z LCR < Z LR ) .

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Answer 2

Term Impedance :

• Impedance, denoted by the letter Z, is a measurement of resistance to electrical flow.

• The resistance is measured in ohms. Impedance and resistance are the same thing in DC systems, and are defined as the voltage across an element divided by the current (R = V/I).

Explain why  :

• The impedance of an LR circuit is $Z_{LR}=\sqrt[]{R^{2} + x_{L} ^{2} }$  , where Xl is the inductor's reactance. When L and R are connected in series with a capacitor of capacitance C, the impedance,

• $Z_{LCR}=\sqrt[]{R^{2} +( x_{L} - x_{C})^{2} }$  because in the case of an inductor, the current lags behind the voltage by a phase angle of rad, but in the case of a capacitor, the current lags behind the voltage by a phase angle of rad

• A phase angle of rad separates the current from the voltage. The total impedance  $(Z_{LCR} < Z_{LR})$  drops as net reactance falls.