How many joules of energy does a 100-watt light bulb use per hour?

Watt is a unit of power that is a simplified form of the quotient of joules and seconds. 
  
                                    1 Watt = 1 joule / second

It is known that 1 hour is equal to 60 minutes that is also equal to 60 seconds. Converting 1 hour to second,

              1 hour x (60 minutes/1 hour) x (60 seconds/1 minute)  = 3600 sec

Thus, for every hour, there is 3600 seconds.

                                   Energy = (100 Joule/second)(3600 s)
                                   Energy = 360,000 joule

Thus, the energy emitted by the bulb is equal to 360,000 joule. 

Bis the answerhope it !

This  kingdom  is  made  up of species that  do  not really easily fit into other kingdoms such as the plant, animal,and  fungi  kingdom. some protists, such as the paramecium  and  amoeba, feed  on  other  organisms  while others such as algae are able to  make their own food  through the process of photosynthesis.