There are many ways of explaining root mean square (rms) voltage and current at different levels of complexity, to advanced...

Teaching Guidance 14-16

It would be easy to leave AC as a slightly mysterious version of the direct currents that you deal with in simple DC...

Teaching Guidance 14-16

A CRO (cathode ray oscilloscope) is a good voltmeter. The electron stream from the electron gun obeys instructions to move up...

Teaching Guidance 14-16