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What is the difference between voltage supply and voltmeter reading of a circuit?

April 26, 2017circuit Engineering Mathematics Reading supply voltage voltmeter

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What is the difference between voltage supply and voltmeter reading of a circuit?

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Voltage supply is referred to in a nominal figure ie.120/240 or 347/600 volts. What the actual voltage reading is can vary due to loading on the circuit,distance from the source and control settings at transformer stations. 120/240 ia a ball park figure, it can vary by 4 to 5 volts either way and your electric tools and appliances will work just fine.