An electromagnet is a coil of wire that produces a magnetic field when electric current passes through it. The magnetic field can be strengthened by using an iron core inside the coil or by increasing the amount of current or number of coils. Electromagnets are common components in electronic devices and generators produce electricity by moving a coil of wire within a magnetic field, with the electric current strength affected by the speed of coil movement and number of coils.

1. CHAPTER 13 SECTION 4

2. 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

3. 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

4. ELECTROMAGNETS
• Electromagnets are part of many electronic
gadgets that you use every day.
ex: televisions, fans, computers, and DVD
players

7. Chapter 13 Section 5

8. 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.

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

10. 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.