Domestic AC Voltage at Home is 230V but its Equation is v = Vm Sin θ. Explain the Difference?
Our homes are supplied with sinusoidal voltage whose equation should be (v = Vm Sin θ). But we always say that AC voltage at home is 230V. How do you explain this difference?
The domestic single phase AC supply is 230V, 50Hz (in EU) or 110V 60Hz in US. It is the RMS or effective value. It means that alternating voltage available has the same heating effect as 230V DC. The equation of this alternating voltage:
v = Vm Sin θ
v = Vm Sin ωt ….. (θ = ωt)
v = 230VRMS x √2 Sin 2π x 50 t ….. [Putting Vm = √2 VRMS and ω = 2π]
v = 230VRMS x √2 Sin 314 t Volts
In short, the figure of 110V or 230V is not the exact value of sinusoidal voltage at our homes supplied by the power house. But it is the exact value of RMS voltage i.e. we get the amount of AC voltage having the same effect of 110V DC or 230VDC respectively.
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