Sorry for being so ignorant

Can anyone tell me if possible the wattage of this motor from –

12v – 11amps? Or is that not enough info???

ta

P = IV so 132W

oh so simple thanks

You are welcome

The only bit of my BEng I remember!

Don't forget Motor Watts in is higher than Watts out.

[geek]

That's assuming it's a single phase motor, which of course it almost certainly is being 12v.

Also 132W is the total electrical input, but the useful output will be somewhat less due to efficiency. The efficiency can vary widely depending on the size and type of the motor, but you'll probably be looking at in the region of 70-90%.

[/geek]

Liam

Also...

A motor is an inductive load, so surely the input power will be slightly less than IxV?

Maybe... I was never that good at AC stuff!

Chris

Well of course but I decided not to be that geeky! I'm assuming a 12v motor is DC and we're talking max output so no PWM to consider etc etc. Therefore input power pretty much constant VI

hi whippy
little phrase to we use to remember the formula is
Virgins Are Rare
V= volts A=amps R=resistance (in your case resistance is measured in watts ) simple triangle you can invert to get the other values
V
------------=AxR=V or V divided by R=A or
A R V divided by A = R
hope that helps
cheers les g

Volts does indeed equal Amps times Resistance, but its usually expressed as

V=IR

with the current being I.

If you are measuring in watts then you are dealing with power, and power isnt in the equation above. Thats would be:

P=IV

which is why power as kilowatts is also sometimes called kilovoltamps.

The two can be combined to give

P=I^2 x R

but that can be a step too far for those who only want the basics.

Being a 12V DC fan, there will be a surge current at power up. The 11A quoted may be the max current, not the steady state current.

quote:

---

Originally posted by smart51
Being a 12V DC fan

---

Being a fan of 12v DC, i'm surprised you don't know such ratings on equipment are usually continuous ratings unless they specifically state they are max ratings I love 12v DC too, but for me nothing can quite match 40v DC with a 5v pk-pk triangular wave ripple on top. Mmmmm

You need to get out more


Besides, real men play with 1MV impulses