question_answer 51)

  The most important safety method used for protecting home appliances from short circuiting or overloading is (a) earthing        (b) use of fuse                  (c) use of stabilizers        (d) use of electric meter

Answer:

                  (b) The most important safety, method used for protecting home appliances from short circuiting or overloading is the electric fuse. This is a safety device having thin wire of short length made of tin (25%) and lead (75%) alloy having low melting point around. The fuse wire is of chosen thickness, so as to fix its resistance and hence amount of heating on passage of a particular amount of current. Whenever current through the fuse exceeds the set limit, the fuse wire melts and breaks the circuit. This saves the main circuit components from damage.