Describe how a C.R.O can be used as an a.c voltmeter. 

Describe how a C.R.O can be used as an a.c voltmeter.

• Unknown a.c voltage V is connected to the Y-plates.
• The Y-sensitivity gain setting is adjusted to a suitable value V₀ volts per centimetre
• When the time base is off, the vertical line on the screen is centered and its length L measured
• The unknown a.c voltage, V = V₀L

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