Can I power a 24V oven with a 19V laptop charger?

Kernel_Sanders

I have one of these, which I've only used with two 12V batteries before....

The 'plate' (it's just a sticker) on the back states it's 24V 100W DC, so does that mean it'll only draw 4.2A? My 90W laptop charger has a rated output of 4.74A, which has obviously been calculated by dividing 90 by 19. Am I right in thinking that neither appliance would be at any risk if I tried it?

tavernman

I would guess you may warm an oven chip on the charger before it melts :beer:

enfield_freddy

umm , you got my brain woken up for a minute , I run old motorcycles and struggle getting ampage to run bulbs ,


24v @ 1000w = 41.6 amp , not 4.16

Cornucopia

W = IV

(Power = Current * Voltage)

enfield_freddy

brain fade (to much dave tv) , am I close?

Kernel_Sanders

enfield_freddy wrote: »

24v @ 1000w = 41.6 amp , not 4.16

Methinks you should have gone to Specsavers

Cornucopia wrote: »

W = IV
(Power = Current * Voltage)

Shouldn't that be W = AV?

[Deleted User]

If the oven is just a resistor, it'll draw 3.3A off 19V, and only give you 62.7W. In the unlikely event that it's got a switching regulator in it, then it may try to maintain 100w off 19V, which would be 5.26A.

It's not very likely to have a regulator, but you can find out by varying the input voltage. If the current goes down when the voltage goes down it's just a resistor, if reducing the voltage increases the current then there's a switcher in there.

enfield_freddy

my mistake , I read "oven" and incorrectly assumed 1000w , not the 100w as is shown


not much of an oven at 100w?

shaun_from_Africa

On initial switch on, I wouldn't be surprised to find that the oven will draw a far greater current than 4.2A when connected to a 24V supply and if this is the case, the initial current surge through a 19V laptop power supply will probably blow its internal protection.

paddyrg

100W, blimey, that's a lightbulb not an oven. I think you will probably be disappointed even at 24V!

Likely to be a coil element, basically an inductor, so you would expect a surge when turned on - not an issue for a lorry battery (they are built for it) but a laptop PSU will almost certainly blow - if nothing else because it thinks it's protecting a faulty laptop!!

paddyrg

Kernel_Sanders wrote: »

Methinks you should have gone to Specsavers

Shouldn't that be W = AV?

I is how you denote current, although typically power would be denoted P=IV.

Power (P, measured in W) = Current (I, measured in A) x Voltage (V, measured in Volts)