Small Heater

I really wanted to make a small heater in the battery using small or tiny. The temperature should not be high, just over the normal room temperature. I use it to keep some small piece of metal hot but not hot.

Whya Any resistance in a circuit is a heater of any kind. If I put a resistance of 1000 ohms in a circuit of 12 volts DC, I dissipate 12mW of heat resistance. A typical alkaline battery D capacity of approximately 2.2 ampere-hours. If I replace the supply of 12 V with a single 1.5v cell D, then the current drops to 1.5 mA, and resistance dissipates 1.5 MW. 2200/1.5 = 1467 hours. 1.5MW is not a practical source of heat, but 15MW could be, if a resistance of 100 ohms would work, reducing time by 10 to 147 hours under an ideal scenario. Something less, in real life, because a battery can not sustain a constant 1.5v on the duration of life. The real question is, how much do you need heata Without knowing the requirements, we can not answer this question with final figures. I can use examples as I have to illustrate how things work.

Have you thought about using a bulb, it generates heat and you can adjust the heat by the proximity that you place on your part. You can also use different bulbs to adjust 75W or 150W of heat or more or less. This will give you more choice and make it safer.

Batteries are not an effective source of energy for heat. Even a battery "D" would probably not last more than a day. The disadvantage of a larger dough or rechargeable batteries it is best if you just plug in