question_answer 57)

  An electric kettle consumes 1 kW of electric power when operated at 220V. A fuse wire of what rating must be used for it? (a) 1 A                                   (b) 2 A                                   (c) 4 A                                   (d) 5 A

Answer:

                  (d) Given, power, P = 1 kW = 1000 W Voltage,               V = 220 V Current,                 I = ?                                 Thus, the rating of fuse-wire is 5 A which is greater than 4.5 A.