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Even without looking up the electrical specifications of the product, we know that

its electrical resistance is relatively low. Any device designed to produce heat must

have a low resistance.

Let's just pull some numbers out of the air:

-- 1500 square feet in the house

-- industry recommends 35 BTU per square foot in your area ==> 52,500 BTU furnace required

-- 3,400 BTU ==> 1 KW; 52,500 BTU ==> 15.4 KW

-- to operate from 240 VAC

Power = E2 / R

15,400 = (240)2 / R

R = (240)2/15,400 = 3.74 ohms

And that's just the heating coils. The big air-mover fans that distribute the

heated air throughout the house are also in parallel, so the load across the

240V service when the furnace is running is less than 3.74 ohms.

We're guessing that electric furnaces don't operate from a normal 120VAC line.

If one did, the corresponding resistance to produce the same amount of heat

would be 0.935 ohm !

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