Unless you have a clamp meter, measuring current by measuring the voltage drop across a known resistance is usually safer, both for yourself and the multimeter – forgetting to move the test leads from the 10 A input back to the V/mA input is a great way to short things the next time you try to measure a voltage, and forgetting to move the test leads from the V/mA input to the 10 A input when measuring current is a great way to blow the fuses in your multimeter 
(and they’re often expensive, at least if they’re good enough to actually protect the multimeter).
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