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AC Theory
Lesson 6
| Question | Answer |
|---|---|
| Whenever current flows through a conductor, a(n) ____ field is created around the conductor. | Magnetic |
| Whenever a conductor cuts through magnetic lines of flux, a(n) ____ is induced into the conductor. | Voltage or EMF |
| The direction of induced current flow through a conductor is determined by the ____ of the magnetic field surrounding the conductor and the ____ that the conductor is traveling through the magnetic field. | direction direction |
| When no current flows in a conductor, free electrons move at ____ their magnetic fields ____. | random random/cancel |
| Describe briefly how a magnetic field is produced when current flows in a conductor. | When voltage is applied, free electrons moved in one direction and their magnetic fields add. |
| The important factors needed for generation of an induced voltage are a(n) ____, a(n), and ____ motion. | conductor a magnetic field relative |
| As the current passing through a coil increases, the magnetic field that it causes around the coil will ____. | increase |
| An EMF is induced when an conductor moves through a magnetic field. Is an EMF also induced when the field moves and the conductor remains stationary? Explain. | Yes. If you have a conductor and a magnetic field and movement between them you will generate induced voltage |
| Whenever an electric current flows through a conductor, a magnetic field is formed ____ the conductor | around |
| As current flow decreases, the magnetic field surrounding the conductor____ (decreases/remains the same/ increases). | decreases |
| State Lenz's Law | A magnetic field that induces voltage and a magnetic field that is produced by the induced current oppose each other |
| Inductors always oppose a(n) ____ of current. | change |
| Counterelectromotive Force is sometimes called ____ EMF, and CEMF is ____ (how many) degrees out of phase with the applied voltage. | back 180° |
| CEMF ____(subtracts from/adds to) the applied EMF when current is increasing and ____ (subtracts from/adds to) the current when it is decreasing. | adds subtracts |
| List some factors that work in combination to affect the inductance produced by an inductor | Number of turns of wire space between the turns cross-sectional area of the core permeability of the core material cr |
| The unit of inductance is the ____, and is represented by the letter ____. | henry L |
| How is the unit of inductance defined? | When a current change of 1 ampere per second causes an induced voltage of 1 volt |
| Iron core inductors cannot be used for high-frequency applications because of ____ loss and ____ in the core material. | eddy current hysteresis |
| State the formula for calculating the inductance(circular core inductor) based upon the physical factors. | L = 3.19N² x A x µ/ 10^8 l |
| Inductance is ____ (directly proportional/inversely proportional) to the number of turns of wire, the type of core material used, and the cross sectional area of the core. | directly proportional |
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SM76502