What is the effect of variation in supply voltage?

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A: Depends on the circuitry involved an op amp normally has a 90 Db rejection from variation, Logic gates however are more sensitive to power supply variation for the simple point that triggering points changes which translate in false triggering and the circuits miss behaving
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What is effective voltage?

It is the 'as if' voltage in an AC circuit. Referred to as Vrms 120 volts in your house is Vrms, the effective voltage, 'as if' it were DC 120V, can do the same work. But 120V

What voltages are supplies by the power supply on your system?

The power supply in a PC is a complex device using switch mode circuitry and transformers to generate +and- 12v, for modems and communications ports. +and-5volts for the logic

Is there a voltage variation to your house?

There are always voltage variations to your house. The utility company is mandated to keep the fluctuations to within a 10 % tolerance. When heavy loads drop off the the utili