How electricity is generated Reviews Exercises

5.10 How electricity is generated Reviews Exercises

1. Define the term “generator."
2. State the three major parts of a direct current generator.
3. With the aid of a sketch, explain how e.m.f. is induced in a direct current generator.
4. Explain how a simple direct current generator may be improved for greater e.m.f. induction.
5. Define the term ''piezoelectricity."
6. With the aid of sketches, explain how thermocouples may be used to produce a higher voltage.
7. Explain how solar cells produce electricity.
8. List three applications of solar cells in everyday life.
9. State two uses of geothermal energy.

Cells and Batteries Review Exercises

4.7 Cells and Batteries Review Exercises

1. State the difference between primary and secondary cells.
2. Make a sketch of a zinc-acid cell and label its parts.
3. Explain how polarization and local action are prevented in the Leclanché cell.
4. Draw a diagram of a Leclanché dry cell and label the parts.
5. State two important features of the lithium air.
6. State the three factors which determine the e.m.f. of a cell.
7. Use schematic symbols to show how four dry cells are connected so as to provide double the voltage of one cell.
8. Explain the difference between cells and batteries.
9. State three reasons why lithium ion battery is preferred to power a smartphone than lead-acid battery.

Atomic Theory Definition Review Exercises

3.5 BASIC ATOMIC THEORY REVIEW EXERCISES      

1.       What is an atom?                                         

2.       State the characteristics of an atom.

3.       How do atoms of different elements differ?

4.       List ten elements.

5.       Define the following: Molecule, element and compound.

6.       Deduce electronic configuration and draw the atomic structure of a neutral atom whose atomic number is 14 with 14 neutrons.

7.       What is the principal characteristic of good conductors of electricity?

8.       List four good conductors, starting with the best.

9.       Explain the meaning of the term "poor conductor" and give five examples of such materials.

10.    How do insulators differ from the conductors of electricity?

11.    What are the characteristics of a pure semi-conductor?

12.    Name the two most common semi-conductor materials and state their main applications in industry.

Occupational Information Network Review Exercises

2.4 Occupational Information Review Exercises

1.       List the four branches of an electrical and electronics engineering field.

2.       For each branch of electrical engineering named in question 1 above, describe briefly its operations.

3.       State why are licenses required in installation work by private contractors?

4.       List any five companies which are involved in the field of communication engineering.

5.       Define the following terms as applied in electrical engineering occupations:

a.       Artisan.

b.      Craftsman.

c.       Technician.

d.      Engineer.

6.       Describe briefly the educational requirements for each of the categories of workers in question 5 above.

Safety Review Exercises

1.11 Safety Review Exercises

         i.            List six items of protective clothing and state where each is used.

       ii.            Distinguish between a face shield and a helmet.

      iii.            List three methods of storing tools.

     iv.            List four possible causes of electric shocks.

       v.            Why should first aid be administered?

     vi.            State conditions necessary for fire to commence.

    vii.            Explain how one can extinguish an electric fire.

  viii.            Where would you place a fire extinguisher at home?  State reason for your selection.

     ix.            Give reasons for not taking shelter under a tree when it is raining.