I connected a 22 ohm(that is the lowest resistor i could find) resistor in series with a oscilloscope probe. My supply voltage is 4.2V, with 22 ohm resistor voltage dropped to 3.36 when servo was being actuated.

I measured that 3.36 by place the prob on the positive supply of the servo in my circuit.

So I concluded the servo current draw using ohm's law

**3.36/22 = 152 mA roughly.**

Just want somebody to verify, if my method of evaluating the current is valid and my calculations are making sense.