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 Author Topic: get heat from battery (question)?  (Read 1442 times) 0 Members and 1 Guest are viewing this topic.
Sulaymaniyah-Kurdistan-Iraq
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 « on: November 16, 2012, 08:15:54 am » Bigger Smaller Reset

hi
i want to convert 9v battery or 12 volt battery into heat, i mean to get a heat from the battery to warm something up, it not important if the heat is not too much??
is it possible?
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 « Reply #1 on: November 16, 2012, 08:41:11 am » Bigger Smaller Reset

Energy in a battery can be converted to heat.  Use a resistor.  Current is voltage/resistance. Current times voltage is heat in watts.  If you dump a 12V battery into a 2 Ohm resistor you will get 6A of current and thus 12(V)*6(A) = 72 Watts of heat.
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 « Reply #2 on: November 16, 2012, 08:56:46 am » Bigger Smaller Reset

hi
i want to convert 9v battery or 12 volt battery into heat, i mean to get a heat from the battery to warm something up, it not important if the heat is not too much??
is it possible?

Seems like an expensive way to do it. A battery won't last long if you draw enough current to make it hot. Why not use a normal heating element?

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 « Reply #3 on: November 16, 2012, 08:58:36 am » Bigger Smaller Reset

Energy in a battery can be converted to heat.  Use a resistor.  Current is voltage/resistance. Current times voltage is heat in watts.  If you dump a 12V battery into a 2 Ohm resistor you will get 6A of current and thus 12(V)*6(A) = 72 Watts of heat.
... and a very smokey resistor ...

Make sure your resistor can handle the power, or it will burst into flames.  A little ¼W one wouldn't be suitable

You can make your own heating element using Nickel Chromium (NiChrome) wire.  A good source for this is from an old electric heater, surprisingly enough
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Sulaymaniyah-Kurdistan-Iraq
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 « Reply #4 on: November 16, 2012, 09:23:38 am » Bigger Smaller Reset

i couldn't what you all said
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Sulaymaniyah-Kurdistan-Iraq
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 « Reply #5 on: November 16, 2012, 09:27:20 am » Bigger Smaller Reset

can i get a enough heat by 9v  battery and normal heating element??
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Valencia, Spain
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 « Reply #6 on: November 16, 2012, 09:31:41 am » Bigger Smaller Reset

can i get a enough heat by 9v  battery and normal heating element??

Enough heat for what? You'll get better answers if you tell people what you're trying to do.

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Sulaymaniyah-Kurdistan-Iraq
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 « Reply #7 on: November 16, 2012, 09:37:06 am » Bigger Smaller Reset

can i get a enough heat by 9v  battery and normal heating element??

Enough heat for what? You'll get better answers if you tell people what you're trying to do.

for water!
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 « Reply #8 on: November 16, 2012, 09:42:31 am » Bigger Smaller Reset

How much water? What temperature increase do you need?
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Sulaymaniyah-Kurdistan-Iraq
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 « Reply #9 on: November 16, 2012, 09:44:11 am » Bigger Smaller Reset

the amount of water is less than 2 L and change  the temperature up to  25c from 10c
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 « Reply #10 on: November 16, 2012, 10:52:02 am » Bigger Smaller Reset

the amount of water is less than 2 L and change  the temperature up to  25c from 10c
Over how long a period?  (i.e., how fast do you want it to heat up?)
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 « Reply #11 on: November 16, 2012, 10:57:17 am » Bigger Smaller Reset

the amount of water is less than 2 L and change  the temperature up to  25c from 10c

How many joules of energy is that? How many are in your battery?

Answer: Over 120Kj of heat needed, only 18Kj in a 9V battery. You'll need about 15 batteries to do it.

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Sulaymaniyah-Kurdistan-Iraq
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 « Reply #12 on: November 16, 2012, 11:06:18 am » Bigger Smaller Reset

the time as fast as it can
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 « Reply #13 on: November 16, 2012, 01:38:04 pm » Bigger Smaller Reset

Answer: Over 120Kj of heat needed.

120,000 Joules = 33.333 Watt-hours

A 100 Watt heater would heat the water in 1/3 hour (20 minutes). Do you need faster heating?

200 Watts would take 10 minutes.

2,000 Watts would take 1 minute.

20,000 Watts would take 6 seconds.
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 « Reply #14 on: November 16, 2012, 01:54:52 pm » Bigger Smaller Reset

Quote
20,000 Watts would take 6 seconds.
...annnd a 9V battery would take 10 days.

9V at 150ma = 1.35W
333Wh/1.35W = 246hours

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