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What is the typical value of resistance of an electric furnace?
Wiki User
∙ 13y ago
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 !
Wiki User
∙ 13y ago
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