An electric fan uses around 50 watt-hours of electricity per hour.

On one level, I do understand why the author wrote it this way, but man the way popular media complicates things by using units like “watt-hours per hour” (i.e., just plain old watts…) rankles me.

Just give the power consumption (watts or kilowatts) and then if appropriate relate that to the (kilo)watt-hour unit that we see on our power bill.