I'm on the opposite side of this question. I've offered to explain motorcycle charging systems in terms anyone can understand. My thought is to use the water flow analogy. Voltage => pressure. Current => flow volume. Resistance => constrictions in the system (or things where the water does work.) Flow at one point in the system must match flow in other parts except for places where water can accumulate (battery => pressure tank.)

My biggest issue is how to depict this in a format that I can share over Skype without putting in 80 hours of work. I might go with a series of pencil drawings and scan them in.

Are any of the suggested materials particularly suitable for this kind of presentation? This is intended to be a 20 minute or so presentation so I'm really just providing highlights. Points I want to get across include:

- Resistance anywhere in the circuit will cause problems. (e.g. bad ground connection.)

- Bad starting can be the result of a insufficient battery charge.

- Bad starting can be the result of high battery internal resistance.

- Bad starting can be the result of high resistance in the circuit.

- Operating with loads (e.g auxiliary lights and heated vest) that draw slightly more power than the charging system delivers can work for hours until the battery is discharged and the charging system no longer supports the loads. (DAMHIK!)

Thanks!

edit:formatting