Physics Formulae
Transformers
P = VI or VI = P
where
P = power
V = voltage
I = current
This is an appropriate formula to use to determine the current of the a.c. input supply, given the power and voltage of the source.
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current, I = P/V
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The e.m.f. or voltage induced in a coil is dependent on the number of turns (N).
Hence,
Vp α Np
and
Vs α Ns
where
Vp and Vs are voltage induced in the primary and secondary coils, respectively
Np and Ns are the number of turns in the primary and secondary coils, respectively.
From the above
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Vp / Vs = Np / Ns
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According to the Law of Conservation of Energy, for an ideal transformer
the power in the primary (input) coil = the power in the secondary (output) coil
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Vp Ip = VsIs
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The efficiency of a transformer can be determined as follows
Efficiency = output power / input power X 100%
==========================
Efficiency = VsIs / Vp Ip X 100%
==========================
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P = VI or VI = P
di mana
P = kuasa
V = voltan (beza keupayaan)
I = arus
arus, I = P/V
Vp / Vs = Np / Ns
di mana
Vp = voltan pada gegelung primer
Vs = voltan pada gegelung sekunder
Np = bilangan lilitan pada gegelung primer
Ns = bilangan lilitan pada gegelung sekunder
Vp Ip = VsIs
Kecekapan = VsIs / Vp Ip X 100%
P = VI or VI = P
di mana
P = kuasa
V = voltan (beza keupayaan)
I = arus
arus, I = P/V
Vp / Vs = Np / Ns
di mana
Vp = voltan pada gegelung primer
Vs = voltan pada gegelung sekunder
Np = bilangan lilitan pada gegelung primer
Ns = bilangan lilitan pada gegelung sekunder
Vp Ip = VsIs
Kecekapan = VsIs / Vp Ip X 100%