What is the approximate output capacity of a 20-kilowatt electric furnace?

To determine the output capacity of a 20-kilowatt electric furnace in terms of BTUs (British Thermal Units) per hour, we can use a conversion factor. Each kilowatt is approximately equivalent to 3,412 BTUs per hour. Therefore, to find the output capacity, we multiply the number of kilowatts by this conversion factor:

20 kilowatts x 3,412 BTUs/kilowatt = 68,240 BTUs per hour.

Rounding this value gives an approximate output capacity of 68,000 BTUs per hour. This calculation confirms that the choice indicating 68,000 BTUs per hour accurately reflects the output capacity of a 20-kilowatt electric furnace.