unit 10 lesson 5 how do we use electricity?apr 10, 2019 · unit 10 lesson 5 how do we use...
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Unit 10 Lesson 5 How Do We Use Electricity?
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 10 Lesson 5 How Do We Use Electricity?
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 10 Lesson 5 How Do We Use Electricity?
Copyright © Houghton Mifflin Harcourt Publishing Company
Electricity Has Many Uses
Unit 10 Lesson 5 How Do We Use Electricity?
Copyright © Houghton Mifflin Harcourt Publishing Company
Electricity Has Many Uses
• Your life would change if electricity did not exist. • Electrical appliances make life easier. • Devices that use electricity change electrical
energy into other types of energy
Unit 10 Lesson 5 How Do We Use Electricity?
Copyright © Houghton Mifflin Harcourt Publishing Company
Electricity Has Many Uses
Light energy
Sound energy
Heat energy
Unit 10 Lesson 5 How Do We Use Electricity?
Copyright © Houghton Mifflin Harcourt Publishing Company
Electricity Has Many Uses
Unit 10 Lesson 5 How Do We Use Electricity?
Copyright © Houghton Mifflin Harcourt Publishing Company
Electricity Has Many Uses
• The electric motor is a machine found in many
appliances that converts electrical energy into energy of motion.
Unit 10 Lesson 5 How Do We Use Electricity?
Copyright © Houghton Mifflin Harcourt Publishing Company
Electricity Has Many Uses
• What objects in this picture have been replaced with objects that run on electric motors?
Unit 10 Lesson 5 How Do We Use Electricity?
Copyright © Houghton Mifflin Harcourt Publishing Company
Electricity Has Many Uses
Unit 10 Lesson 5 How Do We Use Electricity?
Copyright © Houghton Mifflin Harcourt Publishing Company
Magnets and Magnitism
• A magnet is an object that attracts iron and a few other metals.
• Magnetism is a physical property of matter.
Unit 10 Lesson 5 How Do We Use Electricity?
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Magnets and Magnitism
• A magnetic field is the space around a magnet
where the force of the magnet acts.
Unit 10 Lesson 5 How Do We Use Electricity?
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Magnets and Magnitism
• Each magnet had two ends, or poles, where its magnetic field is strongest.
• One end is called the south-seeking pole, or S pole.
• The other end is called the north-seeking pole, or N pole.
Unit 10 Lesson 5 How Do We Use Electricity?
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Magnets and Magnitism
• Two N poles or two S poles are similar.
• If you place the N poles of two magnets near each other, they push each other away, or repel. Two S poles will push away, too.
Unit 10 Lesson 5 How Do We Use Electricity?
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Magnets and Magnitism
• An N pole and an S pole are unlike poles.
• If you place unlike poles of two magnets near
each other, they attract, or pull toward each other.
Unit 10 Lesson 5 How Do We Use Electricity?
Copyright © Houghton Mifflin Harcourt Publishing Company
Magnets and Magnitism
Unit 10 Lesson 5 How Do We Use Electricity?
Copyright © Houghton Mifflin Harcourt Publishing Company
Electromagnets
• Moving a magnet and a wire near each other produces an electric current.
Hand cranked light bulb
Unit 10 Lesson 5 How Do We Use Electricity?
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Electromagnets
• A device in which current produces magnetism is called an electromagnet.
• Wrapping a coil of current-carrying wire around an
iron nail makes the nail a magnet.
Unit 10 Lesson 5 How Do We Use Electricity?
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Electromagnets
Unit 10 Lesson 5 How Do We Use Electricity?
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Electromagnets
• Electromagnets are very important and useful.
• Every electric motor contains at least one electromagnet.
• Electromagnets can be found in telephones, doorbells, speakers, computers, doctors use electromagnets to take picture of the inside of the body.
Unit 10 Lesson 5 How Do We Use Electricity?
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Electromagnets
Unit 10 Lesson 5 How Do We Use Electricity?
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Generating Electricity •In a hydroelectric dam, the mechanical energy of falling water can be converted to electrical energy.
Unit 10 Lesson 5 How Do We Use Electricity?
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Generating Electricity
• Energy stations may use water, coal, or atoms to produce electricity.
Unit 10 Lesson 5 How Do We Use Electricity?
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Generating Electricity
• Renewable resources are resources that will never run out. Sunlight and falling water are examples.
• Coal is a limited, or nonrenewable, resource. It
will eventually run out. • Conserving electricity helps conserve resources
that will eventually run out.
Unit 10 Lesson 5 How Do We Use Electricity?
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Generating Electricity
• Wind mills can generate electricity.
Unit 10 Lesson 5 How Do We Use Electricity?
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Generating Electricity
• A device that converts mechanical energy to electrical energy is called a generator.
Unit 10 Lesson 5 How Do We Use Electricity?
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Generating Electricity
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