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What is the difference among isolation transformers and step up or step down transformer?
Actually an isolation transformer may be physically the similar as a Step up/Step Down transformer. The main difference is in the way they are used.
Another difference is that in a normal transformer there will be capacitance among the 2 windings, between the windings and core, among the core and shell, etc.
These capacitances bring in high frequency noise from outside, which will be transmitted in the secondary circuit. So [in an isolation transformer] wires are connected among each component, (not direct contact, but with insulation present). This allows a leakage current and eliminates unnecessary capacitance.
Depending on the material of the resistance element, resistors are classified into linear resistors and non linear resistors. Majority of the resistors used in electronic circuits
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