Analog Electronics
In analog circuits a high impedance node is one that does not have any low impedance paths to any other nodes. Since the terms low and high depend on context to some extent, it is possible in principle for some high impedance nodes to be described as low impedance in one context, and high impedance in another.
High impedance nodes have higher thermal noise and are more prone to capacitive and inductive noise pick up. They are often difficult to probe as the impedance of a scope or meter can heavily affect the signal or voltage on the node. High impedance nodes are used because some transducers require a high impedance load, and useful in amplifiers since high impedance allows for large voltage gains without large power consumption.
Read more about this topic: High Impedance
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