Usually associated with switching power supply when dormant to active the input impedance can change dramatically until-operating normally
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you can use an impedence converter or a voltage follower
Digital voltmeter has high input impedence.
A: Yes it does since the break down is not exactly very linear.
the quality factor for choke coil is impedence divided by resistance in a given circuit
If a surge protector had a very high resistance at all voltages, the wires in the surge protector would short out. It would kick off the protector and make it useless. A new surge protector would need to be purchased.