In electronics, high impedance means that a point in a circuit (a node) allows a relatively small amount of current through. High impedance circuits are low current, high voltage, whereas low impedance circuits are the opposite.
Read more about High Impedance: Digital Electronics, Analog Electronics
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“The disadvantage of men not knowing the past is that they do not know the present. History is a hill or high point of vantage, from which alone men see the town in which they live or the age in which they are living.”
—Gilbert Keith Chesterton (1874–1936)