High resistance

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The term high resistance , which is widespread in electrical engineering, is used in the sense of having a high electrical resistance . The term is derived from the unit of measurement ohm .

This denotes the input resistance or output resistance of electrical circuits and devices in particular . The extreme case of high resistance is an interrupted line. The counterpart to the high-resistance input or output is the low-resistance input / output with low resistance.

A special case occurs with digital technology components when an output can output the low level or the high level with low resistance , but can also be switched to a third, high-resistance state ( tristate ) in which the output is switched off.

Examples:

  • A high-impedance input is desirable in a voltage measuring device that is intended to draw as little electrical current as possible from the device under test.
  • A high-resistance output is required if it is to be connected in parallel with another output ; only one may be low resistance.
  • A low-resistance electrical energy source behaves like a linear voltage source , a high-resistance electrical energy source like a linear current source .

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  • Johann Siegl: Circuit technology - analog and mixed analog-digital. Springer, 2005.
  • Klaus Fricke: Digital technology. Springer, 2007.
  • Wilfried Weißgerber: Electrical engineering for engineers 2. Vieweg + Teubner, 2008.
  • Erwin Böhmer, Dietmar Ehrhardt, Wolfgang Oberschelp: Elements of applied electronics. Vieweg, 2007.