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Solution
Q2. One kilowatt-hour (1 kWh) is equivalent to a power of 1 kW being used for 1 hour,

 1 k W h = l kilowatt × 1 hour = 1000 watts × 3600 seconds = 3,600,000 watt-seconds or joules  = 3.6 x 106  J  

Q3. Fuse wire are made of alloy of lead​ and tin​.
 Fuse wire is made of material of high resistance and low melting point. 

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