Electrical And Electronics Engineering- U. Bakshi, V. Bakshi

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D. e. f. f. 5 V are connected (a) in series, (b) in parallel. f. and internal resistance of the batteries so formed. f. 2 V. d. 8 V when a load taking 80 A is connected. Find the internal resistance of the battery. What would be the terminal voltage when a load taking 20 A is connected? 7 Primary cells Primary cells cannot be recharged, that is, the conversion of chemical energy to electrical energy is irreversible and the cell cannot be used once the chemicals are exhausted. Examples of primary cells include the Leclanch´e cell and the mercury cell.

Secondary cells can be recharged after use, that is, the conversion of chemical energy to electrical energy is reversible and the cell may be used many times. Examples of secondary cells include the lead–acid cell and the alkaline cell. Practical applications of such cells include car batteries, telephone circuits and for traction purposes – such as milk delivery vans and fork lift trucks. Lead–acid cell A typical lead–acid cell is constructed of: (i) A container made of glass, ebonite or plastic.

25 . 2 Temperature coefficient of resistance In general, as the temperature of a material increases, most conductors increase in resistance, insulators decrease in resistance, whilst the resistance of some special alloys remain almost constant. The temperature coefficient of resistance of a material is the increase in the resistance of a 1 TLFeBOOK RESISTANCE VARIATION resistor of that material when it is subjected to a rise of temperature of 1° C. The symbol used for the temperature coefficient of resistance is ˛ (Greek alpha).

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