I’m working on a wearable battery project and I think I need to use a regulator on the battery output.
Let’s say I were to connect the battery to an LM317 (detailed here) or an LM7812 (see figure 1) circuit with nothing else connected to the output. Would there be current flow through the circuit? Would the battery discharge more quickly than it would in storage?
Figure 1: LM7812 Circuit
Furthermore, does the current draw (in amperes to clarify) from a voltage regulator depend on the requirements of the components connected? If I connected two LEDs in parallel to the output of a voltage regulator, would the current be greater than if only 1 LED was connected? Does the power draw (in watts to clarify) from a voltage regulator differ from the current, or does the current change in direct proportion to the power?