The resistance RS to
be connected in series with a voltmeter of full scale
voltage VV and full scale current
drain IV to increase the full scale
voltage to V is:
RS = (V - VV) /
IV
The power P dissipated by the
resistance RS with voltage drop (V
- VV) carrying current IV
is:
P = (V - VV)2 /
RS = (V - VV)IV = IV2RS
