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A coil, having both resistance and inductance, has a total effective impedance of 50Ω and phase angle of the current through it with respect to the voltage across it is 45゜lag. The coil is connected in series with a 40Ω resistor across a sinusoidal supply. The circuit current is 3A. By constructing a phasor diagram, estimate the supply voltage and the circuit phase angle.
Ans: 250V, 26゜lagging
請問呢題點計?(電學功課15點)
2007-12-07 7:10 am
回答 (1)
2007-12-07 5:36 pm
✔ 最佳答案
The impedance of the coil= 50 ∠45 deg ohm
The impedance of the coil and a 40 ohm resistor in series
= 50 ∠45 deg + 40 ohm
= 35.355 + 35.355j + 40 ohm
= 75.355 + 35.355j ohm
= 83.237 ∠25.135 deg ohm
The circuit current is 3A
The supply voltage = 83.237 * 3 V
= 249.71V
The circuit phase angle is 25.135 deg lagging
I hope this can help with your understanding. =)
參考: My knowledge
收錄日期: 2021-04-13 14:40:03
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071206000051KK04320