Applications of Electricity 239 



Another application of electricity is the X-ray, used largely 

 in the practice of medicine and of surgery. 



Radio, or wireless communication, is one of the most won- 

 derful applications of electricity. 



FACT AND THOUGHT QUESTIONS 



1. What is meant by the chemical effects of electricity? 



2. Describe the electrolysis of water. 



3. Describe the method of electroplating. 



4. Name several household utensils and furnishings that may be electro- 

 plated. 



5. Name several common electric heating and cooking devices. 



6. Explain the principle of electricity on which any electric heatmg device 

 depends. 



7. Name some advantages of electric heating devices in the home. 



8. Describe the incandescent light. 



9. How may one waste electric current? 



10. What is a fuse? Explain its value. 



11. What is the X-ray? Give practical illustrations of its use. 



12. Name ways in which electricity is used for signaling. 



13. What is radio communication? Name the essential parts of a radio 

 receiving set. 



14. Compare the use and value of phonographs and radios. 



PROJECTS 



1. Bring a fuse to school, show its structure and explain its use. 



2. Make a labeled sketch of the main parts of a radio receiving set. 



3. Find out what you can about electric signals for street traffic or rail- 

 roads. Explain the working of a simple system. 



OUTDOOR OBSERVATION 



1. Observe the electric lighting of streets, signs, and show windows in 

 your neighborhood. Observe the arrangement of lights and the means 

 taken to cast the light where it is most effective or of most service. 



2. Observe the different forms of radio aerials in your neighbor- 

 hood. Observe how they are mounted, and how wire connections are 

 made. 



3. Summarize all the uses of electricity you observe in your neighborhood. 



REFERENCES 



Everyday Electricity Wade 



Radio Theory and Operating Loomis 



