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The impedance of an electric circuit may be defined as:
- a)the opposition of circuit to flow of alternating current
- b)a phenomenon in which applied voltage and resulting current are not in-phase
- c)the frequency at which resonance occurs
- d)a phenomenon in which applied voltage and resulting current are in-phase
Correct answer is option 'A'. Can you explain this answer?
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The impedance of an electric circuit may be defined as:a)the oppositio...
Resistance
It is an electrical parameter that is used as the measurement of opposition to the electric current.
The reciprocal of the resistance is called the 'Admittance'.
Resistance is defined as:
R = ρl/A
ρ: Resistivity of the material
l: length of the conductor
A: Area of the cross-section of the conductor.
It is measured in Ω.
Impedance:
The complex quantity of the resistance is defined as the Impedance of a circuit.
It is the same as that of the resistance.
Admittance
It is defined as the parameter which is used to measure the flow of current easily in a circuit.
admitatance = 1/resistance
It is measured in Ω-1 or Siemens(S).
From Ohm's law admittance is:
Admittance = I/V
Capacitance
It is an electrical element that stores energy in the form of a static electric charge.
Energy stored in a capacitor is:
E = 1/2CV2
V: Voltage across the capacitor.
SI unit is Farads. (F)
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The impedance of an electric circuit may be defined as:a)the opposition of circuit to flow of alternating currentb)a phenomenon in which applied voltage and resulting current are not in-phasec)the frequency at which resonance occursd)a phenomenon in which applied voltage and resulting current are in-phaseCorrect answer is option 'A'. Can you explain this answer?
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