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Table of Contents

Оглавление

LESSON NO. B-1

Electrical Conductors

Electrical Insulators

Play It Safe

Electrical Terms

WHAT TO DO: Make A Circuit Board

Parallel Wiring

Series Wiring

SUGGESTED DEMONSTRATIONS

Water And Electricity

For More Information

What Did You Learn?

LESSON NO. B-2

TOOLS FOR ELECTRICIANS

Basic Tools for Electrical Work

WHAT TO DO: Build a Tool Chest

Demonstrations You Can Give

For Further Information

LESSON NO. B-3

What's In A Lamp?

WHAT TO DO—Rewire A Lamp

How To Do It

What Did You Learn?

SUGGESTED DEMONSTRATIONS

For More Information

LESSON NO. B-4

MAKE A TROUBLE LIGHT.

What Size Cord?

Cord, Plug and Guard

How to Make the Trouble Light

What Did You Learn?

Ideas for Demonstrations and Exhibits

For More Information

LESSON NO. B-5

WHAT MAKES MOTORS RUN

Motors Are Magnets

We Can Improve It

We Need An Electromagnet

Switching Poles Automatically

Increasing Efficiency

WHAT TO DO: Make A Motor

Step No. 1-Armature

Step No. 2-Commutator

Step No. 3-Field

Step No. 4—Armature Supports and Brushes

Demonstrations You Can Give

For Further Information

LESSON NO. B-6

TAKING CARE OF ELECTRIC MOTORS

You'll Need

WHAT TO DO

What Did You Learn?

Demonstrations You Can Give

For Further Information

ELECTRIC MOTORS SERVICE CHART Sample

LESSON NO. B-7

READING THE ELECTRIC METER

Reading a Meter

What's Your Electric Bill?

Estimating Operating Costs

Adding Low Cost Helpers

WHAT TO DO: Find the Cost of Operating Electrical Equipment

Demonstrations You Can Give

For Further Information

LESSON NO. B-8

IRONING IS FUN WITH THE MODERN HAND IRON

Important Things to Know

The Iron and Safety

WHAT TO DO: Learn About Your Iron

IRONING IS FUN

Demonstrations You Can Give

For More Information

LESSON NO. B-9

WHAT TO DO

SAFETY TIPS

4-H Electric Hazard Hunt Guide

How Many Hazards Did You Find?

Demonstrations You Can Give

For Further Information

LESSON NO. B-10

HOW ELECTRIC BELLS WORK—FOR YOU

What to Do

Bells and Buzzers Can Tell a Lot

Why They Buzz or Ring—Electromagnetism

A Special Kind of Electricity

How to Control Them

Pick the Right Bell or Buzzer

How to Plan Your System

Materials You'll Need

Install According to Your Plan

Demonstrations You Can Give

For More Information

LESSON NO. B-11

FIRST AID FOR ELECTRICAL INJURIES

What to Do

Electricity Can Kill

Prevent Accidents

Think, Then Act

First Aid

Mouth-To-Mouth Rescue Breathing

What Did You Learn? True or False

Demonstrations You Can Give

For More Information

LESSON NO. B-12

HOW ELECTRICITY HEATS

What to Do

"Resistance" Makes Heat

Make a Simple Resistance Heater

Conduction is "Touching" Heat

Convection Depends on Air

Radiation is Like the Sun

Make Popcorn 3 Ways

What Did You Learn?

LESSON NO. B-13

MYSTERIOUS MAGNETISM

What to Do

"See" a Magnetic Field

Make an Electro-Magnet

Make a Permanent Magnet

See How They Attract and Repel

Make Many From One

Magnetism and Animals

What Did You Learn?

LESSON NO. B-14

Give your appliances and lights a square meal

What to Do

Count Your Electrical Blessings

Some Homes Are Behind Times

Watch for Signs of Starvation

Each Circuit Big Enough

Only One Fuse Size Right

Make a Circuit Chart

Check the Wire Sizes

Replace Any Wrong-Size Fuses

Talk it Over With Your Parents

What Did You Learn?

Demonstrations You Can Give

For More Information

LESSON NO. B-15

YOU CAN MEASURE ELECTRICITY

What to Do

How They Work

Detect a Magnetic Field

Detect a Tiny Current

Make a Simple Galvanoscope

Measure the Voltage of Batteries

Test for Induced Current

What Did You Learn?

Demonstrations You Can Give

For More Information

Electricity for the 4-H Scientist

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