Power conversion look-up table

[TheMechwarrior]

I've been wanting to do this for some time, so here it is folks :handgestures-thumbupleft:

I hope you find it useful.



Cheers,

Mech.

[Brendan]

Fark that, just tell people it's P=VI and they can work it out :-D

Good on ya Mech.

[Yummyrum]

Nice table Mech but it can only be used to find power by having a volt and amp meter.

It can't be used to predict what voltage and current to expect for a desired power.

To do this , you first need to know the resistance of your element.

R = V*V / P

so if you have a 2400 W element it has a resistance of 24 ohms....this is a constant

If you have a 3600 w element it has a resistance of 16 ohms

So now we can calcylate the expected Voltage needed to get ex amount of power.

V = square root of P* R

So If you want 1000 w from your 3600 w element

V=sqrt 1000*16
=126.5 volts

[1 2many]

I can never remember the formulas so I use android apps, there is a heap of good ones that give most of the answers you will need :handgestures-thumbupleft:

[TheMechwarrior]

Thanks yummy, I'll look at that. My power controllers are feeding 3600W elements but my controllers report volts and amps only. So I wanted a simple printout I could use to really convert to Watts.

I'm also building a 2400W element version.

[Brendan]

I'm also building a 2400W element version.

Make sure a meter with a power reading in there ;-)

[TheMechwarrior]

The are both equipped with digital meters that simultaneously report volts and amps.

[Yummyrum]

Mech have you seen these.
They are true RMS reading and the one meter measures Current and Voltage and can display either of these as well as power.They are only about $80 and made by a manufacturer thats been making reliable meters for decades. viewtopic.php?f=60&t=6375#p108524

True RMS meters take thousands of samples per second and perform a mathmatic average to determine the true value.Wheras most simple meters simply rectify and filter to obtain the reading......they can be quite out and if you're multiplying two wrong readings , it can be very wrong .

BTW I was wondering how hard would it be to do a chart or graph like you did but display power verses Volts for each of the commonly available elements .

Say 1380W for the old still spirits

2000w for the T500

2200w for the game ones

2400 & 3600w for macs ones

[TheMechwarrior]

They look bloody nice yummy, ta :handgestures-thumbupleft:

I've been using these: http://www.ebay.co.uk/itm/Blue-LCD-AC-v ... 0804066630

The tables you've requested would be easy, if I have time to tomorrow I'll build them and upload.

Cheers,

Mech.

[Brendan]

You can also buy one of those power meters that you can get for about $20, bust them open and install into your controller, as they display power as well...assuming you are qualified to do so of course.