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Physical Science
Chapter 7, Part 1
| Question | Answer |
|---|---|
| A device that increases or decreases voltage in a power line is called a ___ | transformer |
| Current that does not reverse direction is called ____ | direct current |
| The location of the strongest magnetic forces on a magnet are the ____ | magnetic poles |
| Current that reverses direction in a regular pattern is called ___ | alternating current |
| The region around a magnet where the magnetic forces act is the ____ | magnetic field |
| Objects that keep there magnetic properties for a long time are called ____ | permanent magnets |
| An instrument electric current is a _____ | galvanometer |
| A reversing switch that rotates with the coil in an electric motor and reverses the direction of the current every half turn is a ____ | commutator |
| A device that increases or decreases the voltage of an alternating current is a ___ | transformer |
| The strength of magnetic force in an electromagnetic is ___ by increasing the current through the coil | increased |
| The function of an electric motor is to _____ | change electrical energy to mechanical energy |
| The function of a generator is to _____ | change mechanical energy to electrical energy |
| A ____ attracts iron objects | magnet |
| _____ is the process of producing an electrical current by moving a looped wire through a magnet field | electromagnetic induction |
| The atoms in a magnet are ____ | alined according to there magnet poles |
| A galvanometer measures _____ | electric current |
| A transformer that increases voltage is a _____ | step up transformer |
| alternating current is transmitted across large distances at high voltage to minimize ____ | energy lost as heat |
| Groups of atoms alined with magnetic poles are called ____ | magnet domains |
| In a concept map concerning the strength of the magnetic field of an electromagnet the strength can be shown to be increased by _____ | increasing the amount of current |
| In a concept map describing magnetic domain the atoms in a permanent magnet should be described as _____ | alined |
| What serves as the energy source? | battery |
Created by:
Jodom