How much power does this fan consume/waste?

Question

About 125 volts, 50 Hz and 40 W.

About how much money is that in a month if used daily?

Answer 1

enginerd has the right idea, but .04 KW * 6 cents/KWh is .24 cents/hour, or 5.76 cents per day if used all day.  That's $1.728 per 30 days of continuous use.  In many areas, electricity costs considerably more than 6 cents per KWh.  To find its efficiency, you'd need to know how much of that 40 watts of electric energy is transferred to the air as kinetic energy.  Most of the 'wasted' energy is heat.  A ceiling fan is generally more efficient than a table fan.

Answer 2

If it pulls 40W, that is the energy used, regardless of the voltage or the frequency.

If it is rated at 40W it might not actually pull that much in normal use, but lets go with that.

40W=.04 KW

each hour that you run it then will consume .04 KW-hrs (which is how electricity is usually billed).

Now, the price you pay for electricity depends on where you live and possibly the time of day you use it.  You can probably get the cost off your electricity bill.

Lets assume you pay about 7 cents/KW-hr (thats pretty high)

.06 $/KW-hr*.04KW-hr/hr=.0042 $/hr

if you run it 12 hrs/day, then

12*.0042=$.05/day

or, about 5 cents/day (10 cents/day if you run it all day)

Your cost may be more (or less) depending on your cost of electricity.