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Explain what causes physical vibrations in transformers at twice the frequency of the AC power involved.

Short Answer

Expert verified

When AC passes through the coils of a transformer, magnetic materials can change their shape or size.

Step by step solution

01

Definition of frequency and AC power

The electromagnetic induction and mutual induction laws of Faraday are the foundation of how the transformer operates. On the transformer core, there are typically two coils: a primary coil and a secondary coil. Strips are used to link the core laminations. The mutual inductance of the two coils is very high.

The number of times a repeated event occurs per unit of time is known as frequency. It's also referred to as temporal frequency to distinguish it from spatial frequency, and ordinary frequency to distinguish it from angular frequency.

Energy storage components such as inductors and capacitors can cause periodic reversals of the direction of energy flow in alternating current circuits; the watt is the SI unit for this.

02

Explanation

Vibrations in a transformer normally occur at twice the frequency of AC electricity. The AC that passes through the coils of a transformer has a magnetic impact on the core.

Magnetostriction in a magnetic core causes vibrations, which is the property of magnetic materials to change their shape or size during magnetization.

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Most popular questions from this chapter

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 2.50Ωresistor, a 100μHinductor, and a 80.0μFcapacitor. (a) Find the circuit's impedance at120Hz. (b) Find the circuit's impedance at5.00kHz. (c) If the voltage source has Vrms=5.60V, what isIrmsat each frequency? (d) What is the resonant frequency of the circuit? (e) What isIrms 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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