Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Bushong Ch4
Electricity, Magnetism, & Electromagnetism
| Question | Answer |
|---|---|
| The smallest unit of electrical charge is the____. | Electron |
| Electrification occurs through the movement of______. | Electrons only |
| Like charges _____ and unlike charges _____. | Repel, Attract |
| Electrostatic force is _____ proportional to the distance between charges, and _____ proportional to the product of the charges. | Inversely, Directly |
| The charges on an electrified object are distributed _____. | Evenly throughout the object |
| On the surface of an electrified object, the charges concentrate on the _____. | Sharpest curvatures |
| A _____ is a source of direct current. | Battery |
| What is a unit of electric potential? | Volt |
| An electric potential applied to a conductor produces what? | An electric current |
| An alternating current is represented by what kind of a line? | Sinusoidal |
| A flashlight uses what kind of current? | Direct current |
| A generator produces what kind of current? | Alternating current |
| What is Ohm's Law? | V=IR The voltage across the total circuit is equal to the current times the resistance |
| A charged particle in motion creates what? | A magnetic field |
| Electrical power is measured in ___. | Watts |
| Rubber and glass are examples of _____. | Insulators |
| A coil of wire is called what? | Solenoid |
| Any substance through which electrons flow is called what? | A conductor |
| The study of electrons in motion. | Electrodynamics |
| A material that under some conditions behaves as an insulator and in other conditions behaves as a conductor. | Semiconductor |
| The rotation of electrons on their axis is the property called _____. | Electron spin |
| Lines of a magnetic field always form ____. | Closed magnetic loops |
| _______ is the ability of a material to attract the lines of magnetic field intensity. | Magnetic Permeability |
| Magnets are classified under what three principal types? | Naturally occurring, Artificially, and Electromagnetic |
| The degree in which a material can be magnetized. | Magnetic Susceptibility |
| The SI unity of magnetic field strength | Tesla (T) |
| Electric potential is measured in units of ______. | joule per coulomb, or volt |
| This powers the rotating anode of an x-ray tube. | Induction motor |
| This has one winding and varies both voltage and current. | Autotransformer |
| When a group of dipoles are aligned this creates a _______. | Magnetic domain |
| Water and plastic are what types of materials? | Diamagnetic- weakly repelled |
| Electrification can be created by: | Contact, friction, or induction |
| The study of stationary electric charges. | Electrostatics |
| Magnetic intensity of an electromagnet is greatly increase by the addition of a(n) _______. | Iron core |
| The force between magnetic poles is proportional to the _____ of the magnetic pole strengths, divided by the ______ of the distance between them. | Product, square |
| This has equal matter and energy, and may have an electric charge. | Matter |
| The US alternating current goes through a complete cycle every _____ second. | 1/60 |
| Superconducting materials such as, ______ and ______ allow electrons to flow without resistance. | Niobium, Titanium |
| Best example of a natural magnet. | Earth |
| These materials are Nonmagnetic- unaffected by a magnetic field. | Wood, glass |
| Ferromagnetic objects can be made into magnets by a process called _____. | Induction |
| Varying magnetic field intensity induces an ______. | Electric current |
| A transformer with a turns ratio greater then 1. | Step-up transformer |
| Name for a current measuring device. | Ammeter |
| Faraday's Law states that the magnitude of the current depends on four factors: | 1. Strength of the magnetic field. 2.Velocity of the magnetic field 3.The angle of the conductor 4.The number of turns in the conductor. |
| A transformer with a turn less than 1. | Step-down transformer |
| These materials can be strongly magnetized and are called Ferromagnetic. | Iron, Nickel, and Cobalt |
| Glass,clay and other earth like materials are usually good _____. | Electric insulators |
| These semiconductor materials led to the development of microchips and a rise in computer technology. | Silicon (Si), Germanium (Ge), Selenium |
| The force of attraction between unlike charges, or the repulsion of like charges. | Electrostatic force |
| The primary function of the x-ray imaging system is to convert electricity into _____. | Electromagnetic energy |
| Paired electrons with opposite spins have_____. | No magnetic field |
| Magnetic lines of force travel from ______ to ______. | North to South |
| The ends of magnets where iron filing attach most strongly and with greater concentration. | Poles |
| Excellent temporary magnet, and only a magnet while its magnetism is being induced. | Soft Iron |
| Permanent magnet that retains its magnetism when removed from the external field. | Hard Iron |
| Paired electrons spinning in the same direction have ______. | Magnetic field |
Created by:
JEN311
Popular Physics sets