When RL =∞ and no current whatsoever is being drawn by the load, the practical source is open-circuited and the terminal voltage, or open-circuit voltage, is VLoc = 12 V. If, on the other hand, RL = 0, thereby short-circuiting the load terminals, then a load current or short-circuit current, ILsc = 1200 A, would flow. (In practice, such an experiment would probably result in the destruction of the short circuit, the battery, and any measuring instruments incorporated in the circuit!)