Chapter 23: Q16CQ (page 858)
Explain what causes physical vibrations in transformers at twice the frequency of the AC power involved.
Short Answer
When AC passes through the coils of a transformer, magnetic materials can change their shape or size.
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Chapter 23: Q16CQ (page 858)
Explain what causes physical vibrations in transformers at twice the frequency of the AC power involved.
When AC passes through the coils of a transformer, magnetic materials can change their shape or size.
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A large power plant generates electricity at 12.0 kV. Its old transformer once converted the voltage to 335 kV. The secondary of this transformer is being replaced so that its output can be 750 kV for more efficient cross-country transmission on upgraded transmission lines.
(a) What is the ratio of turns in the new secondary compared with the old secondary?
(b) What is the ratio of new current output to old output (at 335 kV) for the same power? (c) If the upgraded transmission lines have the same resistance, what is the ratio of new line power loss to old?
An RLC series circuit has a resistor, a inductor, and a capacitor. (a) Find the circuit's impedance at. (b) Find the circuit's impedance at. (c) If the voltage source has , what isat each frequency? (d) What is the resonant frequency of the circuit? (e) What is at resonance?
When the \(20.0{\rm{ }}A\) current through an inductor is turned off in \(1.50{\rm{ }}ms\), an \(800{\rm{ }}V\) emf is induced, opposing the change. What is the value of the self-inductance?
Suppose you have a supply of inductors ranging from \(1.00{\rm{ }}nH\) to\(10.0{\rm{ }}H\), and resistors ranging from \(0.100{\rm{ }}\Omega \) to\(1.00{\rm{ }}M\Omega \). What is the range of characteristic \(RL\) time constants you can produce by connecting a single resistor to a single inductor?
(a) What current flows when a\(60.0{\rm{ }}Hz,{\rm{ }}480{\rm{ }}V\)AC source is connected to a 0\(0.250{\rm{ }}\mu F\)capacitor? (b) What would the current be at\(25.0{\rm{ }}kHz\)?
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