One mega watt hour is equal to.....?

Question

a) #36* 10^6#J b) #36* 10^12#J

c) #36* 10^9#J d) #36* 10^8#J

please explain.

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Answer 1 · 2018-03-27T20:29:01

#3.6 * 10^9J#

in one mega watt hour, one mega watt is used every second for an hour.

there are #3600# seconds in an hour.

the prefix 'mega' before a quantity means that the quantity is multiplied by #10^6#.

one megawatt is #1 * 10^6# watts.

one watt is #1# joule per second, so one megawatt is #1 * 10^6# joules per second.

in a mega watt hour, #3600 * 10^6# joules would be used.

#3600 * 10^6# is the same as #3.6 * 10^9#.

in a mega watt hour, #3.6 * 10^9# joules would be used.