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CBSE Class 12-science Answered

2 differences between resistance,raectance and impedance?
Asked by Lekha | 27 Feb, 2013, 06:05: AM
answered-by-expert Expert Answer
Resistance is when voltage & current stay in phase, and it follows basic Ohms law.

Reactance is when Voltage & current are 90deg out of phase(in capacitive /inductive ckt). Depending on whether it is +90 (lead) or -90 (lag) it is called an inductive reactance or capacitive reactance. Reactance is normally denoted by the imaginary operator 'j'

Impedance is a combination of both of the above. It is usually rep as a complex number like 2 - j3.5.
The phase angle between V & I could be any value.
Answered by | 27 Feb, 2013, 12:22: PM

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