Most of the digital meters on the market are autoranging which means that there is no range adjustment (or rather that it autoranges by default). Do you really want to measure household current or are you looking to measure voltage and possibly continuity (much more common for a homeowner)?
Like OP I am also trying to gain some utility from my meter. I'm a girl, so the first thing I did was read my manual - and it tells me how to do X, Y, and Z.
But, it would be helpful to know where to learn some theory so that I understand. Or, in a given troubleshooting situation, what to test. Or, what's normal readings at: switch (on and off), outlet, light fixture, etc.
Eg. I know how to test resistance, just not when or why I'd want to test it.
Checking resistance (continuity) will test switches and other devices. When checking resistance first make sure there is no power on what you're testing or you'll let the magic smoke out of your meter.
Current (I, for the French word intensité) make things go.
If things don't go, check that voltage (V) is present. I=V/R.
If no V, then no I.
If V is present in the right amount but not enough I is there, then R (resistance) must be too high. There is no other reason, in a DC circuit.
R is for DC circuits.
Z, impedance, is for AC circuits. Z can get messy to deal with.
Troubleshooting is a science onto itself.
If you get into a situation that seems to violate V = IR it means you are assuming something that is not true. There are many ways this can happen.
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