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41) You are given two fuse wire A and B with current rating 2A and 5A respectively .Which of the two wires would you select for use with a 1000W, 220 V room heater ? justify your answer .
For a,   1000 W , 220 V  heater ,
Power , P = V * I = 1000W ,
 I = 1000 / 220 = 4.54 A
ie,  The maximum current flow will be 
I = 4.54 A 

So , fuse wire of approximately  5A can provide the protection.
If you are using 2A fuse wire , it fuses out suddenly and the device will not work , because the maximum allowable current is only 2A


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