Why the resistance of ammeter is very low and of voltmeter is very high?
In: Physics
You don’t want your measuring device to change the thing you’re measuring. Since series resistances add together, having your ammeter add as little resistance as possible minimizes its influence on the current.
Likewise, changing the current flow will change the voltage drop (in most circuits). Since the voltmeter is going to span between two different voltages, current is going to want to flow, and resistance is a measure of how difficult that is.
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