Alternating Current Circuits in Physics
Dive into the principles of alternating current circuits in physics, covering electromagnetic induction, voltage and current characteristics, power calculations, and the concept of power factor in AC circuits.
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Presentation Transcript
11. Alternating current circuit Physics I-2022, Lecture 11-6 1
11. Alternating current (AC) circuit The source of alternating current (alternator) utilizes electromagnetic induction: ?= ? ? ?? consider coil with Z turns rotating by mechanical force in uniform mag. field AC source ?(?) = ??sin(??) ?= ???? sin(??) time characteristics of voltage: rotating coil time characteristic of current: ?(?) = ??sin(?? + ?) ?(?) a ?(?) different phase 2 Physics I-2022, Lecture 11-6
power of alternation current ?(?) = ??sin(?? + ?) ?(?) = ??sin(??) instantaneous power = ????sin(??)sin(?? + ?) ?(?) = ? ? ?(?) active power P mean value of power in the time of one period ???=?? 2 and ???=U? 2 - effective values ? =???? cos? = ??????cos? 2 cos - power factor cos = voltage and current the same phase, in phase 3 Physics I-2022, Lecture 11-6
End of video 11-6 Physics I-2022, Lecture 11-6 4
