Mastering Electrical Engineering by Noel M. Morris (auth.)

By Noel M. Morris (auth.)

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Machine) via carbon brushes. c. c. d. c. c. d. l ATOMIC STRUCTURE About 100 basic substances or chemical elements are known to man, each element consisting of a number of smaller parts known as atoms. Each atom comprises several much smaller particles, the principle ones being electrons, protons and neutrons. The difference between the smaller particles lies not only in their difference in mass (a proton is 1840 times more 'massive' than an electron), but also in the electrical charge associated with them.

How do electrons, protons and neutrons differ? 2. Copper is a conductor and glass is an insulator. Why do these materials have different electrical resistance? Why is a 'semiconductor' so named? 3. Explain the terms 'voltage' and 'potential drop'. 4. d. of 20 V across it. 5. d. across the circuit being 10 V. 6. The following values of current were measured in a circuit when the voltage across the circuit was (i) 10 V, (ii) 20 V, (iii) 30 V: 10 A, 40 A, 150 A. Plot the 1-V characteristic of the circuit and state if it is linear or non-linear.

The principal reason for the latter is polarisation of one of the electrodes, and is due to hydrogen gas bubbles collecting on its surface. 3. In the process of producing a voltage, hydrogen gas bubbles form on the surface of the copper electrode. f. 2). Moreover, since hydrogen is a poor conductor of electricity, the internal resistance of the cell would be very high. This has a further effect of reducing the terminal voltage when current is drawn from it. The effects of polarisation are overcome by adding a chemical to the electrode; the function of the chemical is to combine with the hydrogen to form water.

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