Electromagnetism |
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Electricity · Magnetism · Magnetic permeability |
Electrical impedance is the amount of opposition that a circuit presents to current or voltage change.
The two main ways to write an impedance are:(see the 2nd figure, "complex impedance plane")
The Impedance and the resistance are quite similar:
In the case of resistance, a resistor resists any current going through it. The higher the resistance, the higher the voltage that is needed to achieve a given current. The formula is: