Appendix A


Ampere (A)

The unit of measurement of electric current.


Electronic device or circuit that produces an output signal with greater power, voltage, or current than that provided by the input signal.

Capacitance (C)

The capability of a component to store an electric charge when voltage is applied across the component, measured in farads.


A component that stores electric charge when voltage is applied to it. It can return the charge to a circuit in the form of an electric current when the voltage is removed.

Current (I)

The amount of electric charge flowing through a circuit, measured in amperes.


A component that conducts current in one direction only.

Discrete components

Individual electronic parts such as resistors, diodes, capacitors, and transistors.

Farad (F)

The unit of measurement of capacitance.


A connection from the output of an amplifier back to the input. In some instances, a portion of the output voltage is used to control, stabilize, or modify the operation of the amplifier. However, in some instances, unwanted feedback can cause a squealing noise or can cancel another signal.


Electronic circuit that can either block or pass frequencies that fall within a certain range.

Frequency (f)

Number of cycles of a waveform that occurs in a given time period, measured in hertz (cycles per second).


Zero volts. This is the arbitrary reference point in a circuit from which all voltage measurements are made.

Henry (H) ...

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