Magnet, Electromagnets, And Electric Motor Review 1/30/14

Question 0

if you reverse the direction of current flow in an electromagnet the north and south poles are

Answer 0

Reversed

Question 1

the source of a material’s magnetism is spin of its

Answer 1

Electrons

Question 2

is used to convert mechanical energy into electrical energy

Answer 2

Electrical generator

Question 3

uses two coils to change the voltage of the electricity coming into your home

Answer 3

Transformer

Question 4

magnetic field lines outside a magnet points away from its______pole and toward its_______pole

Answer 4

North, South

Question 5

keep its magnetic properties even when it is not near other magnets

Answer 5

Permanent magnets

Question 6

is a magnet created by electric current in a coiled wire

Answer 6

Electromagnet

Question 7

is present in the region around a magnet

Answer 7

Magnetic field

Question 8

is used to convert electrical energy into mechanical energy

Answer 8

Electric motor

Question 9

Is simply a permanent magnet that is free to spin

Answer 9

Compass

Question 10

is used in a motor to switch the direction of the magnetic field created by the current

Answer 10

Commutator

Question 11

iron, nickel and cobalt are called______because they have strong magnetic properties

Answer 11

Ferromagnetic

Question 12

Molten iron and nickel in the ________ spin around the solid inner core and produced huge electric currents that produce Earth’s magnetic field

Answer 12

Outer ore

Question 13

using a magnet to create electric current in a wire is called

Answer 13

Electromagnetic induction

Question 14

Who discovered that electric current makes magnetism?

Answer 14

Christian Oersted

Question 15

2 ways to increase strength of electromagnet

Answer 15

More power

More coils

Question 16

Separation of positive and negative change makes

Answer 16

Dipole

Question 17

Shitty formula, remember if faggot if u wanna sleep early nigga

Answer 17

V1/V2=N1/N2