Q40 of 238 Page 115

A vacuum cleaner draws a current of 2 A from the mains supply.

(a) What is the appropriate value of the fuse to be fitted in its circuit?


(b) What will happen if a 13 A fuse is fitted in its circuit?

(a) the appropriate value of the fuse to be fitted in the circuit is 3A.

(b) if a 13 A fuse is fitted in its circuit, short-circuiting or overloading occur which can damage the vacuum cleaner.


More from this chapter

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38

An air-conditioner of 3.2 kW power rating is connected to a domestic electric circuit having a current rating of 10 A. The voltage of power supply is 220 V. What will happen when this air-conditioner is switched on? Explain your answer.

 39

Three appliances are connected in parallel to the same source which provides a voltage of 220 V. A fuse connected to the source will blow if the current from the source exceeds 10 A. If the three appliances are rated at 60 W, 500 W and 1200 W at 220 V, will the fuse blow?

 41

Which of the following circuits will still be dangerous even if the fuse blows off and electric iron stops working during a short circuit?

 42

An electric kettle rated as 1200 W at 220 V and a toaster rated at 1000 W at 220 V are both connected in parallel to a source of 220 V. If the fuse connected to the source blows when the current exceeds 9.0 A, can both appliances be used at the same time? illustrate your answer with calculations.