Oops; my error. Not 18 watts per bulb. Six watts per bulb!!! Two bulbs =3D 12 watts, 24 hours =3D 288 watts per day, 365 days x 0.288 = =3D
105.12 k.watt hours. At ten cents =3D $10.50 at 15 cents about $15 per annum. Sorry bout that. Must wake up this morning!
No, they will consume 18 watts of power. They will consume
18watt-hours per hour and 960 watt-hours per 24 hour day.The watt is the RATE of burning power - the WATT HOUR is the AMOUNT of power used.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D Getting a bit off- base as a result of my basic error. Again sorry about that .............. The Op said they are six (6) watt bulbs (I incorrectly used 18 watts) and have corrected that.
But don't understand the above posting at all !!!!!!!!!!!!!!!!!!!!
Two separate and identical six watt bulbs will use electrcity at the rate of 12 watts per hour.
Two separate and say identical 18 watts bulbs will use electrical energy at twice the rate as one bulb. s an example ...
If I have a bedside lamp with say a single 40 watt bulb in it; when switched on it will use 40 watts. (i.e. 40 watt hours) OK?
If one simultaneously switches on another lamp also equipped with a 40 watt bulb it will also use 40 watts.
For total of consumption of 80 watts per hour. So twice 40 watts =3D 80, or twice 18 watts =3D 36, or twice 6 watts =3D 12 is the same principle.
Ignoring that expression "If there is a nit to be picked, some nit-wit will pick it", the following is I hope a now correct calculation using six (6) watt bulbs.
Six watts at 18 volts is one third of an amp. For two bulbs (12 watts) that's two thirds of one amp.
Assuming that a 110 to 18 volt transformer is not too inefficient and is rated for continuous service, the whole set up will/should consume about 14 watts to the primary 110 volt input side.
The continuous 14 watts per hour will (At an electricity rate of 10 cents per k.watt hour) will cost; Per Day about 3.4 cents Per Month about 1.00 dollar Per year about 12 dollars.
BTW Ref. the: " < No, they will consume 18 watts of power. They will consume
It's your terminology I'm calling into question. It is NOT 12 watts per hour. It is 12 watts, period. If the lamps drew 12 watts of POWER, the consume 12 watt-hours of (energy) electricity in an hour, and 36 watt hours in 3 hours. It is not watts per hour. In your last example the 2 40 watt bulbs dissipate 80 watts of power - whether for 15 seconds or 6 weeks. The ENERGY consumption is that number of watts times the amount of time - generally rated in watt hours - and kilowatt hours - although watt-seconds are also used.(also called a joule) A watt is a unit of power. A joule is a unit of energy, as is a watt-hour.
................. EACH!
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