Chapter 9
General term for a device that transforms the energy of an electric current into another useful form of energy
load
substances that can be easily magnetized
magnetically soft
the rate of charge flow
Current
a device that uses electromagnetic induction to produce electricity
generator
an electrical switch operated by an electromagnet
relay
device that uses a narrow strip of metal in a protective insulated case to limit current through a circuit
fuse
the imaginary line that encircles the earth halfway between the two magnetic poles
magnetic equator
when the opposite poles of two magnets are facing each other, what is the pattern of the lines of flux. Will they be connected or will they be repelled from each other?
Connected
what device consists of one or more electrochemical cells connected as a single source of current
What early device was developed to store electric charge
Leyden Jar
The SI Unit of electric charge
coulomb
what are the imaginary lines that indicate the direction and strength of a magnetic field called
lines of flux
What is an electric field with even strength throughout
Uniform
what device converts pulses of electricity into sound waves
loudspeaker
What is the electrostatic method of reproducing images on paper?
Xerography
the transfer of energy of an electric charge by direct contact between object
conduction
the line connecting all points where a compass needle points true north
agonic line
a device that produces a strong magnetic field when electricity passes through it
electromagnet
what communication device uses electromagnets to reproduce messages by means of audible clicks
telegraph
what is a semiconductor device that produces light when a direct current is applied
light emitting diode
an electrical device designed to add resistance to a circuit
resistor
What is the method of magnetism in which an object is permanently magnetized by stroking a magnet against and object?
magnetism by conduct
What has to be broken before you can use it?
An egg
who built the first electrostatic generator
Otto Van Guericke
what type of generator works by passing a conducting fluid through a magnetic field?
magnetohydrodynamic generator