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Calvert Phy Sci Ch 8

Study Guide

QuestionAnswer
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 force 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 their magnetic properties for a long time are called? permanent magnets
An instrument that measures 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 currient is a? transformer
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
What attracts iron objects? magnets
What is the process of producing an electric current by moving a loop of wire through a magnetic field? electromagnetic induction
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 loss as what? heat
Groups of atoms with aligned magnetic poles are called? magnetic domains
What happens to the strength of magnetic force in an electromagnet when you increase the current through the coil? increases
When you bring the south ends of two magnets together, what happens? repel
An electric motor is used to change electrical energy into what type of energy? mechanical
Moving a wire through a magnetic field creates what type of current in the wire? electrical
Paper clips can become what type of magnet? temporary
The gauges on the dashboard of a car are called? galvanometers
Created by: bcalvert
 

 



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