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Electricity — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceElectricity3 Marks
Question
  1. Distinguish between the terms ‘overloading’ and ‘short-circuiting’ as used in domestic circuits.
  2. Why are the coils of electric toasters made of an alloy rather than a pure metal?
✓

Answer

  1. Overloading occurs when an electric circuit draws more current than the permitted value and short circuiting occurs when the ends of a circuit are connected by a conductor of very low resistance as compared to that of circuit.
  2. The coils of electric toaster made of an alloy rather than pure metal because:
  1. Resistivity of alloys is generally higher than its constituent metals.
  2. It has high melting point.
  3. It does not oxidize i.e., burn.

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