Direct current - When current flows in only one direction at all times (e.g. in a battery), Alternating current - When the current changes every fraction of a second (e.g the mains), Mains Voltage - In the UK, this has a declared value of 230 V , r.m.s value - A sort of 'average' value of current or voltage from an a.c supply, Peak voltage - Maximum voltage in an a.c. supply - crest of wave on oscilloscope, Peak current - Maximum current in a.c. supply, Y gain - A setting on oscilloscope that controls the voltage per division - affects the vertical component of the wave , Time base - A setting on oscilloscope which affects the time per division - affects the horizontal component of the wave  ,

Monitoring and Measuring AC

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