RE: DIY Loaded Voltmeter Help
Jonny,
I am assuming this is a receiver battery since you reference servos.
Ohms law states that the resistance = voltage / current or R=E/I
So with 4.8 volts divided by .5 amps (500mAh) you need a 9.6 ohm resistor.
Power = volts x amps so 4.5 x .5 = 2.25 watts.
Your 10 ohm resistor needs to be about three watts.
The easiest way to get there is to use 4 47 ohm resistors in parallel which will give you about 10.2 ohms.
If they are half watt resistors you will have 2 watts of capacity.
I would use one watt resitors or don't leave it plugged in but a few seconds.
I hope this helps.
I think you are going down the right path doing this rather than buying an exspanded scale voltmeter.
This is much more flexible.
Good Luck,
KW_Counter