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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 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 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 current is a? Transformer
This changes electrical energy to mechanical energy. Electric motor
This changes mechanical energy to electrical energy. generator
This attracts iron objects. Magnet
This is the process of producing an electric current by moving a loop of wire through a magnetic field. Electromagnetic induction
The atoms in a magnet are? Aligned according to their magnetic poles
A galvanometer measures? Electric current
A transformer that increases voltage is a? Stepup transformer
Alternating current is transmitted across large distances at high voltage to minimize? energy loss as heat
Groups of atoms with aligned magnetic poles are called? Magnetic domains
The strength of magnetic force in an electromagnet is____by increasing the current through the coil. increased
Created by: bcalvert
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