Measuring Voltages Tutorial
To measure voltages, the meter must be connected ACROSS things; across resistors, across the battery etc.
When measuring DC, connect the red meter lead to the most positive point, and the black one to the most negative.
When measuring AC voltages it doesn't matter which way the leads are connected.
It's best to select a high voltage range on the meter before connecting it and then switching to a lower range if necessary.
This protects the meter, especially moving coil ones, from being damaged by having too high a voltage applied to them.
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