14. Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R) : Assertion (A) : the heating element of electric heater is made up alloys. Reason (R) : alloys have high resistivity and high melting point.
both A and R are true and R is the correct explanation of A
both A and R are true but R is not the correct explanation of A
A is true but R is false
A is false but R is true
Answers
Answer:
OPTION A IS CORRECT
Explanation:
An Alloy has mixture of two metal ions,which are randomly arranged. This leads to more traffic in the path of electron flow. Hence,it causes more resistivity. But melting point of an alloy is much lower than that of its constituent pure metals. This is because the other metal behaves as an impurity in the metal,leading to lower melting point.
An heating device requires constant flow on and flow off current through it. More the melting point of used metal is lower, more easier the connection can cut off, more easier the flow off of the current. Whereas, if the metal has greater melting point, then it takes lot of current to melt it and turn off the flow, which ultimately makes that electronic device more inefficient.
So, an electronic device requires a metal with lower melting point. An alloy is perfect for the case.
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