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A multimeter when used on voltage, has a very high resistance/impedance to limit the current flowing through it. However when you set it to read current, it has a very small resistance to encourage the current to flow through the metre so can be measured. So ig you put a multimeter across a voltage source (in parrallel) when its set to current, you will normally destroy the metre. Although more expensive metres will have a fuse to protect the instrument should this occur. Hope this helps Always switch back, should you do this on the mains, you can quite easily set the metre on fire!! CB Eng

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Q: If you attempted to read the voltage across a car battery with the multimeter accidentally in ammeter mode?
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