An a.c. source of 200 V rms supplies active power of 600 W and reactive power of 800 VAR. The rms current drawn from the source is ____.
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The values 600, 800, and 1000 form a 6:8:10 (or 3:4:5) Pythagorean triple. Recognizing these triples allows you to find the hypotenuse (Apparent Power) instantly without doing long calculations.