22. Explain the following a) Why are conductors of electric heating device
such as toasters and electric iron made of an alloy rather than a pure
metal ?b) How does the resistance of a wire vary with its cross sectional
area ?c) Why is the series arrangement not used for domestic circuits ?
(1+1+1)
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(a) The melting point and of Tungsten is an alloy which has very high melting point and very high resistivity so does not burn easily at a high temperature.
(b) The conductors of electric heating devices such as bread toasters and electric irons are made of alloy because resistivity of an alloy is more than that of metals which produces large amount of heat.
(c) In series circuits voltage is divided. Each component of a series circuit receives a small voltage so the amount of current decreases and the device becomes hot and does not work properly. Hence, series arrangement is not used in domestic circuits.
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