# Chapter 8, Electromagnets, Inductors, and Transformers

Flashcards by pete.c.diaz, updated more than 1 year ago
 Created by pete.c.diaz almost 7 years ago
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Electronics A complete Course Second Edition, Nigel P. Cook

## Resource summary

 Question Answer As current passes through a conductor: a magnetic field is developed When an electromagnet reaches maximum strength, it is considered to be: at saturation A rapidly reversing magnetic field causes heat dissipation know as: Hysteresis loss A conductor’s magnetic field causes heat dissipation know as: current flowing through it Electromagnetism induction is the generation of: electricity from magnetism An inductor is rated by a unit named: Henry What is one characteristic of an induction? passes dc Inductance is the ability of a coil to oppose: current change The formula to determine total inductance when inductors are connected in parallel is similar to: Series capacitors 10. Three parallel inductors of 84 mh, 96 mh, and 160 mh, will provide a total inductance of how many millihenrys? 35 Opposition to current flow without the dissipation of energy is called: Inductive reactance In an inductive circuit, reactance will: XL = 2^ f L Increase with frequency What is the phase angle in a purely inductive circuit? 90 degrees 14. What is the inductive reactance of a 1mH coil, when the applied frequency is 15 kHz? XL = 2^f L = 2^(15,000Hz)(.001H) = ? 94.2 ohms 15. What is the impedance of a 1 kHz series RL circuit, when R and XL are both 1000 ohms? Z = R2 + XL2 = (1000)2 + (1000)2 = ? 1414 ohms What is the total impedance of a series circuit, when the applied frequency is 455 KHz, and L=10 mH? XL = 2^ f L = 2^ (455,00)(.010) XL = 28.59 Kohm Zt = (15.)2 + (28.59)2 = ? 32.2 K ohms What is the true power of a 24 Vac parallel RL circuit, when R = 45 ohms, and XL = 1100 ohms? P true = (Vs)2 / R (24v)2 / 45ohm = ? 12.8 watts The circuit impedance for a 60 Vac single coil circuit that has a coil current of 4.47 amps is: V = I Z / Z = V 60v/4.47=? 13.42 ohms

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