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Define admittance in AC circuits.

1 Answer

In AC (Alternating Current) circuits, admittance is a measure of how easily a circuit allows the flow of current. It is the reciprocal of impedance, which is the AC equivalent of resistance in DC circuits. Admittance is denoted by the symbol "Y" and is measured in siemens (S), where 1 siemens equals 1 ampere per volt (A/V).

Admittance consists of two components: conductance (G) and susceptance (B). These components account for the real and imaginary parts of admittance, respectively:

Conductance (G): This represents the real part of admittance and is measured in siemens (S). Conductance is a measure of how easily current can flow through a circuit, analogous to the conductance in a DC circuit.

Susceptance (B): This represents the imaginary part of admittance and is also measured in siemens (S). Susceptance is a measure of how much the circuit reacts to changes in voltage, and it accounts for the capacitive or inductive nature of the circuit.

The relationship between admittance (Y), conductance (G), and susceptance (B) is given by the following formula:

Y = G + jB

Where "j" represents the imaginary unit (√(-1)). In practical AC circuits, admittance is often used to simplify complex impedance calculations, especially in parallel circuit configurations.

In summary, admittance is a measure of the ease with which alternating current flows through a circuit, taking into account both its conductive and reactive properties.
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