# Units of coulombs and volts!

1. Feb 13, 2008

### cemar.

Im just curious what the units are for coulombs and volts in m kg and s.

2. Feb 13, 2008

### chroot

Staff Emeritus
You cannot represent coulombs or volts in terms of only m, kg, and s. The SI system has seven base units (meter, kilogram, second, ampere, kelvin, mole, and candela).

In terms of these base units:

$C = A \cdot s$

$V = \frac{ kg \cdot m^2 }{ A \cdot s^3 }$

- Warren

3. Feb 13, 2008

### mgb_phys

Slightly off topic
Is the Candela still a base unit ?

"The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 10^12 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian."

Sounds like you could define it in terms of energy / length?