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Commonly used terms in the Electrical industry.
input impedance
(1) when a voltage is applied to a conducting material, a current will flow through the material. The ratio of the voltage to the current is known as the input impedance and is a complex number with magnitude measured in units of ohms. See also Ohm's Law.
(2) impedance seen when looking into the input terminals of an antenna. input layer a layer of neurons in a network
that receives inputs from outside the network. In feedforward networks, the set of weights connected directly to the input neurons is often also referred to as the input layer.