If I wanted to build a circuit that would turn on a fan in the attic when it reaches a … The power dissipated in a resistor goes into heating the resistor; this is know as Joule heating. Power dissipated by a resistor is P = I^2 x R or P= V^2/R both derivations of P = I x V and of V= I x R (Ohm’s law). If I stop the current when the correct temperature is reached, the temperature keeps on climbing because some heat is still stored in the resistors heatsink, and I overshoot the target temperature by 2°C for a short amount of time. The last 4 resistors are variable resistors which change according to knob adjustments, heat, and light, respectively. This article deals with the practical matters of heat transfer in power resistors and includes a description of the specific geometry of film resistor parts, as opposed to other technologies such as wire wound resistors. If a resistor has a power rating of 1W, then we should not feed more than 1W to the resistor. A thermistor is a type of resistor that varies its resistance with temperature. Technically I don’t like to use the terms power loss. Some resistors are sensitive to heat and light and vary their resistance in accordance with temperature or brightness. Transferring heat energy generated by power resistors. The above list is an extensive list of the types of resistors which exist today. So I thought to myself, "I have 12v * 6a = 72w power supply, if I'm using 4 x 10w resistors 72 watts would be too much for them." Resistors will heat up as they slow down the current running through the circuit. I hooked them up this way though, the resistors in series, and they barely heat up, so I must not know how these things work even though I thought I did. value. In some cases, however, Joule heating is exploited as a source of heat, such as in a toaster or an electric heater. The problem I have with these resistors is that the inertia is too high. How should they be configured to produce my needed heat. I dissipate the heat with a 12V PC fan . Thus, photoresistors are variable resistors whose resistance values change in regard to the amount of light hitting its surface. Related Resources A resistors power dissipation must be further reduced if it's effected by near by components or resistors that are radiating heat which would effect the surrounding ambient temperature [of the resistor being effected]. https://electrical-engineering-portal.com/resistive-heating-explained-in-details The electric company bills not for power but for energy, using units of kilowatt-hours. If they are getting very hot to the touch and start to boil or smell then you need to get higher power resistors. Resistors are electrical components in an electric circuit that slow down current in the circuit. In many cases, Joule heating is wasted energy. These resistors is that the inertia is too high is wasted energy the terms power.... 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