1.

How many joule of electrical energy is converted into hat and light 50 w lamp is lit for 2 hours ?

Answer» POWER = 50w
t = 2 hrs = 2 * 3600s  = 7200s
ENERGY = ?
energy = power *  TIME
           = 50 * 7200
           = 360000 joules 
           = 3.6 * 10^5 J 



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