Practice Phase Angle (ϕ) (4.2) - Electromagnetic Induction and Alternating

Practice: Phase Angle (ϕ)

Lesson 4.2Electromagnetic Induction and Alternating

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9 questions

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3 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
Define phase angle in your own words.
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Think about the relationship between voltage and current.
Question 2.
What is the formula for calculating inductive reactance?
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Recall the relationship between inductance and frequency.
3Question 3.
What happens to current when inductive reactance is greater than capacitive reactance?
- Current lags voltage
- Current leads voltage
- No change
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Think about the characteristics of inductors.
4Question 4.
True or False: The phase angle is always zero in a purely resistive circuit.
- True
- False
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Consider the relationship between elements in the circuit.
Question 5.
A circuit has R = 6 Ω, L = 0.15 H, and C = 80 µF. What is the phase angle at 50 Hz? Discuss its implications on circuit current.
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Calculate XL = ωL and XC = 1/(ωC) first.
Question 6.
In a specific LCR circuit, if the phase angle is 45 degrees, derive the values of XL and XC when R = 5 Ω. Explain the significance of this angle in terms of circuit performance.
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Use tan(ϕ) relations to express XL in terms of XC.

5 more questions in this section. Enroll free to practise them all.