What is a Resistor?
Resistor is electrical or electronic components which resist the flow of current across the resistor device.
Resistor Symbol
The resistance to current flow results in a voltage drop across the resistor device. Resistors are used extensively throughout electrical and electronic circuits.
Resistor devices may provide a fixed, variable, or adjustable value of resistance. Adjustable resistors are refers to as rheostats, or potentiometers. Resistor values are expressed in Ohms, the electric resistance unit.
Resistors are incorporated within a electrical or electronic circuit create a known voltage drop or current to voltage relationship.
If the electrical current in a circuit is known (current is measured in amperes), then a resistor can be used to create a known potential difference (voltage difference) proportional to that current.
Conversely, if the voltage drop (potential difference) across two points in a circuit is known, a resistor can be used to create a known current proportional to that difference.
An attenuator is a network of two or more resistors (a voltage divider).
A line terminator is a resistor at the end of a transmission line or daisy chain bus, designed to match impedance and minimize reflections of the electronic signal.
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