By George H. Olsen (Auth.)
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What charge is stored by the capacitor? 5. What factors influence the choice of a given type of capacitor for use in an electronic circuit? 6. List the advantages and disadvantages of electrolytic capacitors as compared with other types. 7. Why is magnetically soft iron not used for the cores of inductors that are operated at radio frequencies? 8. What is meant by the term 'time-constant' in relation to an RC circuit? 9. A current is passed through a circuit consisting of a resistor in series with a capacitor.
Transistors can withstand mechanical vibrations and shocks that would ruin a thermionic valve. This is because a transistor is a single-crystal device and therefore has no delicate electrode structure to damage. In addition, there is no vacuum to preserve within a vulnerable glass envelope. Heaters are not required in tran sistors and thus there is a substantial saving of power; a small amplifying thermionic valve usually requires about 2 watts of heater power. Since no heaters are required, transistors operate immediately the supply is connected, no warming up period being necessary.
22. Conduction of electricity in liquids. another chlorine atom in the vicinity (by the sharing of electrons in the outer shell) and chlorine gas is produced. At the cathode sodium atoms are produced, but these react with the water present to form sodium hydroxide and hydrogen gas. The production of sodium comes about because electrons are taken by the sodium ions from the cathode. We see therefore that so far as the battery and lead wires are concerned a currentflowsin the circuit. Within the solution the conduction process, which is really an electro-chemical conversion, is compli cated compared with the conduction in metallic wires.