# Name of battery voltage when load connected/disconnected

If I had a 3V battery, and when no load connected it reads 3.2V, and with a load 2.8V (just a hypothetical example), what is the name for these two terms, with a load or no load?

I know the voltage drop occurs due to its internal resistance when a load is connected, however I still am not sure of the terms. Here's a few which may be of help:

• emf ($\mathcal{E}$)

• Potential difference

• Terminal voltage

Any help would be appreciated in what these terms are called, this is one of those questions where it almost seems too simple to find this answer online.

• Well, voltage is another name for electric "potential difference." Aug 11 '14 at 20:13
• Thanks, I know that however I thought it could be a possible answer for the question, so decided to list it anyway. Aug 11 '14 at 20:14
• I figured you knew, but I was trying to eliminate it (although I've been looking at it more and I'm not sure). Aug 11 '14 at 20:16

For example, modelling the battery as an ideal voltage source with voltage $V_{OC}$ in series with a resistor (to model the internal resistance) $R_{S}$, the voltage across the battery terminals is given by
$$V_{BAT} = V_{OC}\frac{R_L}{R_S + R_L}$$