CHAPTER 13 SECTION 4

ELECTROMAGNETS

–a coil of wire with many loops through which an electric current passes

• To make the field even stronger, the coil is often wrapped around an iron core

But Can I Make It Stronger?

• You can make an electromagnet stronger by increasing the amount of current running through the wire

• Or increasing the number of coils

ELECTROMAGNETS

• Electromagnets are part of many electronic gadgets that you use every day.

ex: televisions, fans, computers, and DVD players

Chapter 13 Section 5

Electrical Energy• changing a magnetic field generates

electricity. • The faster the coiled wire is moved, the

stronger the electric current it produces. • The slower the movement, the weaker the

current. • The number of coiled loops also affects

the strength of the current.

Generators

• machine that creates electric energy by turning coils of wire around powerful magnets

How Are Generators Powered?• Some use the energy of the wind, while others

rely on falling water. • Other generators are powered by steam

caused by the hot temperatures deep below Earth’s surface

• Or by nuclear energy heating the water.