Summary
The physical quantities introduced here are the voltage
and the current
.The relations between the basic electrical elements are the following (using the complex notation):
For a resistor: the voltage and current are proportional
.For an inductance: the voltage follows the time derivative of the current
.For a capacitance: the voltage follows the time integral of the current
.
The impedance of an electrial system describes the reaction of a system (voltage drop across the system) for a given current that flows through it. The impedance is a complex (magnitude, phase), frequency dependent number.
The admittance is defined as the inverse of the impedance.
The most common electroacoustic quadripoles are the ideal transformer and gyrator.
