Can we use “either” for more than two options? The first example imply that you would need a different power source to provide each one of the outputs. What is “either”? The second example implies that it (i.e. it). I would never say that The second instance can be real or artificial. Which type of power source (100, 150, 400) can provide all three options – 100, 200 amps. What are context though, the examples could be construed to include both

meanings, if there is an index, that implies both.