A capacitor is an electrical component which essentially consists of two plates separated by an insulator.
The property of a capacitor to store an electric charge when its plates are at different potential is referred to as capacitance.
Capacitance C = Q/V
If the capacitance is large, more charge is needed to establish a given voltage difference.
The capacitance between two parallel metallic plates of area
Linear Variable Differential Transformer (LVDT)
• There is one primary winding connected to an ac source (50 Hz – 20 kHz), excitation 3 – 15 Vrms.
• Core is made of high permeability soft iron or nickel iron.
• Two secondary windings are connected in series opposition
Ø Geometric centre of coil arrangement is called the NULL position. The output voltage at the null position is ideally zero.
Ø However it is small but nonzero (null voltage). Why?
Ø Harmonics in the excitation voltage and stray capacitance coupling between the primary and the secondary
Ø Manufacturing defects.
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