And on the third day God created the Formula, and named it Ohm's Law.

The fundamental formulas that link these units together are thus:

E = I x R  and  P = E x I.

E is electromotive force, in volts.  I is flow rate, or current, in
amps.  I've no idea why it's the letter I.  R is resistance, in ohms,
and P is power, in watts.

These rearrange to: I = E / R;  R = E / I;  E = P / I;  I = E / P

and by combining them further derive: P = I^2 x R;  P = E^2 / R

With these formulas you can understand what's going on in any part of
a typical automotive circuit.

  --
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'89 Po' White Star "Scamp"