Measuring current

[TinselKoala]

Just to add: the 1 Ohm value for the current sense resistor may be too high (or even too low); I would pick a value of ~1% of the total load resistance.

Of course you can use whatever value you like. Just put the actual value into the Ohm's Law equation to find your current. A one-ohm resistor is convenient because then you don't need to do any math: a voltmeter reading of 100 millivolts will be indicating 100 milliamps of current, for example. But depending on the load, other values of the CSR may be more appropriate.

[memoryman]

TK, I added that not for your (or any other qualified person) benefit, but for people who ask the question in the first place.