Struggling with A.P Physics Question on kWh to Joules Conversion

[rmarkatos]

This is an A.P Physics class which is algebra based and does not use calculus. This problem is really annoying because it is one of the easier questions from the homework but i can't seem to understand the procedure.

One kilowatt x hour (kWh) is the amount of work or energy generated when one kilowatt of power is supplied for a times of one hour. Determine the number of joules of energy in one kilowatt x hour.

Any suggestions?

 

[Swapnil]

This question is just asking you to do a simple unit conversion using the definition of power. As you know from the problem, kiloWatt*Hour is an unit of Energy and you have to convert this unit into Joules.

So you have
kiloWatt*Hour = 1000*Watt*Hour = 1000*Watt*(3600 Second)

Now you know that Watt = Joules/Second

Then you get
1000*Watt*(3600 Second) = 1000*(Joules/Second)*(3600 Second) = 3.6E6 Joules (in scientific notation).

 

[rmarkatos]

Thank you Swapnil