240v kettle on 12v?

[Olderisbetter]

I am looking for a 12v element about 100w so i was wondering if i put a 1800w 240v kettle on a 12v supply would that be a 90w element or there about?

 

[Seadog]

It'll be 4.5W

 

[Kayos]

Id stick an inverter in the middle, job done

 

[bourbon]

get a good book while you wait for it to boil

 

[mtt.tr]

As above about 4.5w

The element resistance is about 32ohms
1800w/240v= 7.5a

Resistance= v/I
240/7.5=32ohms

I(amps)= v/r

12/32=0.36

Watts = v*I
12x0.36=4.3w

 

[8ob]

As above about 4.5w

The element resistance is about 32ohms
1800w/240v= 7.5a

Resistance= v/I
240/7.5=32ohms

I(amps)= v/r

12/32=0.36

Watts = v*I
12x0.36=4.3w

Does that mean the water in the kettle will have evaporated before it boiled

 

[mtt.tr]

Does that mean the water in the kettle will have evaporated before it boiled

Yes and all time will have stopped

 

[brightspark]

just shell out for one of these https://www.amazon.co.uk/Immersion-...8WN4Y88/ref=pd_lpo_1?pd_rd_i=B088WN4Y88&psc=1

 

[Greeves246]

Diesel heater plug?

 

[8ob]

Or a 12v kettle https://www.ebay.co.uk/itm/18497012...MI7O3d9tq09QIViZntCh1yWgPSEAQYBCABEgIlpPD_BwE

Bob

 

[Seadog]

As above about 4.5w

The element resistance is about 32ohms
1800w/240v= 7.5a

Resistance= v/I
240/7.5=32ohms

I(amps)= v/r

12/32=0.36

Watts = v*I
12x0.36=4.3w

P=V²/R=144/32=4.5W

 

[mtt.tr]

P=V²/R=144/32=4.5W

yes indeed the route I would take, but that presumes prior knowledge of ohm's law

 

[Seadog]

Given that 12V is actually not likely and will be greater, then >4.5W

 

[Kram]

However if you used a 3kw kettle it would be around 20R. A boost coverter will get you around 60V, about 170W maximum, 120W at a more sensible input current.

What are you trying to heat?

 

[mike os]

Does that mean the water in the kettle will have evaporated before it boiled

Heat loss will mean the water will be colder the longer it’s heated

 

[optima21]

Does that mean the water in the kettle will have evaporated before it boiled

depends if you're watching it or not, as we all know that a watched kettle never boils

 

[premmington]

Gas stove?

 

[James1979]

As above. I’ve a trangia which is a good bit of kit.

What are you doing is the most important question I guess. If it’s for a vehicle and naked flame isn’t an option then either a proper 12v kettle as @8ob or a second battery and a 24v kettle or a 24-240 inverter. You get a lot more grunt with 24v. I’m not an electrician so don’t know the theory but it works fine in lorries for microwave and kettle

 

[premmington]

As above. I’ve a trangia which is a good bit of kit.

What are you doing is the most important question I guess. If it’s for a vehicle and naked flame isn’t an option then either a proper 12v kettle as @8ob or a second battery and a 24v kettle or a 24-240 inverter. You get a lot more grunt with 24v. I’m not an electrician so don’t know the theory but it works fine in lorries for microwave and kettle

I got a soto muka petrol pressure stove and a little kettle in the van (water tea bags dried milk). I have spoken to Bob on this subject before - he got one of those woodburning things? (kelly kettle) in his van - he is working in the woods!

When a thermos flask is empty - or the job runs on late. Proper men still get a brew!

 

[J1nx]

Unless I’m reading it wrong the OP wants a 100w element and wonders if a kettle would be an easy source. Nowt to do with getting a brew on?