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Questions tagged [heat]

Thermal energy; where it comes from, and how to keep it from damaging components

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3answers
85 views

How to power long (30 ft) nichrome wire from 120v AC wall socket

I am working on making a vacuum forming machine, and I need to power a significant length of nichrome wire off of a 120v AC wall socket. I have very little experience in electronics, but I have talked ...
0
votes
1answer
56 views

Potentiometer is Heating [closed]

I have this light dimmer circuit, when I plug it into the AC, the dimmer works fine but I noticed that the heat in potentiometer is increasing, is there any workaround to fix this problem?
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2answers
45 views

Waste heat in battery pack - large pack vs small pack?

Are larger battery packs more efficient than smaller battery packs due to "resistance in parallel" rule, assuming eveything else being the same? As an example let's consider two 48V battery packs - ...
0
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1answer
60 views

Induction heater [closed]

Please help me out. I am totally confused. I am searching over the internet many times but failed. My question is: Doe inductor coil (chock) decide resonance frequency of induction heating coil, ...
0
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3answers
64 views

Calculate how much heat an IC produces

I'm building a device containing a large number of ICs. Now, I'm 99% certain heat won't be an issue. (Considering the volts and amps involved, I doubt you could accurately detect the amount of heat ...
1
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3answers
66 views

How to calculate Junction to Ambient temperature of LED?

I'm trying to calculate the Junction to Ambient temperature for this Cree LED: https://www.mouser.ca/datasheet/2/90/ds--XHP502-1093532.pdf I know how to calculate this: Junction Temp = Junction to ...
4
votes
2answers
442 views

Heating a box (as a thermodynamics dummy)

I expect to build a dehydrator and am knowledgeable enough for most of it (fan, timer, power supply and so on), bar the most important part: the heating element. If you're not familiar with electric ...
0
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5answers
128 views

How hot should wires get?

I am using 10 AWG wire to power a BLDC motor, and these wires can get quite hot. When an IC is intended for high power uses, it is common practice to put a heat sink on it, but what about for wires? ...
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0answers
24 views

Calculation of Kanthal D Wire Contact Temperature

I need help of professionals to solve a problem I’m struggling with. I have 3 types of Kanthal D wire to chose from. 0.2 mm - 42,8800 Ohm/m , 0.3 mm - 19,05 Ohm/m , 0.4 mm - 10,69 Ohm/m I would ...
3
votes
4answers
540 views

Heat problems when using 5 buck/switching converters in a double isolated enclosure?

I want to use 5 step down converters (220 VAC -> 5V DC) inside an enclosure inside an enclosure (double isolation). The step down converters are similar to these. There will be 5 of them, where one ...
2
votes
2answers
137 views

Voltage regulator with heatsink gets overheated

First of, I'm sorry if I'm using the wrong terms or if I'm pointing out something that is obvious to most, this is not my profession, it's only a hobby. I have an input voltage of 12V 5A which is ...
0
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1answer
62 views

How to calculate the heat dissipated by a battery pack?

I have a battery pack consisting of 720 cells. I want to calculate the heat generated by it. The current of the pack is 345Ah and the pack voltage is 44.4Volts. Each cell has a voltage of 3.7V and ...
5
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6answers
322 views

Can I use DC to drive underfloor heating wire?

I'm in the early phases of designing a new underfloor heating controller for retrofitting solar panels to locations with existing underfloor heating cables, which now take their power from the grid. ...
2
votes
10answers
2k views

Heating a tube of aluminium electrically

I need to regulate the temperature of the surface of a tube of aluminium. The tube is used as a mandrel for composite molding/curing, so the target temperature is below 100C. Currently, there is no ...
0
votes
6answers
205 views

Electrical apliances overheating when receiving LESS voltage

I've been wondering for a while now, why do some electrical appliances overheat and burn out when you lower their incoming voltage? Shouldn't the less voltage mean they receive less current, and less ...
0
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2answers
77 views

Synchronizing IC Temperatures

I have several separate identical PCBs with identical ICs on them. It's fairly critical for this application that all the IC's are synchronized in regards to temperature. E.g. if one increases by 1 ...
3
votes
6answers
233 views

What's the rationale behind these warnings about extension cords?

(Disclaimer: I've read the help center and I do understand that this is bordering on off-topic since it's about consumer devices. However I hope that I've managed to make enough on-topic by asking ...
0
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1answer
38 views

More phase inductance in stepper motor

The selected stepper motor not enough to make required torque. So, I think its better to replace the stepper with higher torque. But, new stepper motor has 2.8mH phase inductance,Old one has 1.2mH. ...
3
votes
2answers
131 views

Is there an upper limit of voltage than can pass through a wire?

The way I understand it, electric wires heat up because there is too much current passing through them. There are tables for various materials, how much current can pass through a given cross-section ...
1
vote
2answers
92 views

Thermal pad thickness

We are going to use GAP PAD HC 5.0 thermal pad to transfer the heat from a FPGA (XCKU040) to a heatsink. My question is regarding the thickness I should choose to obtain best performance. On the one ...
0
votes
3answers
165 views

Do resistors turn electricity into heat?

When wiring resistors to a battery, it generates heat and in the worst case, sets on fire but when it is used to limit current, for example in series to an LED, do they still generate heat ?
4
votes
3answers
166 views

How does current turn to heat/light? [duplicate]

When resistors are serially connected, the current is the same through the whole circuit. To my knowledge, the electric current is electrons traveling. Also, the power of the generator equals the ...
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2answers
33 views

Question about pressurization and introducing air into a small chamber

This is probably very easy to answer, but I'm working on a project where I need to heat a chamber (insulated Styrofoam container), and my option to heat it is essentially a hair dryer, as a heat gun ...
0
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1answer
36 views

Relationship between heat coefficient and conductance

I'm involved in a project and part of it involves heat coefficient and heat conductance. What's the relationship between the two, given that the SI unit for heat coefficient is \$W/mK\$ and the SI ...
0
votes
2answers
71 views

Ways to thermally manage a small enclosure?

hopefully this is an okay place to ask this question, but anyway, I'm working on a project to measure efficiency of a mono-crystalline solar cell based off temperature in the enclosure. The solar cell ...
1
vote
2answers
75 views

Thermal stabilization of TH LED (layout recommendations)

I have to develop a circuit for LED-based optical reference. Due to specific requirements, only available LEDs are in TO-18 packages with metal cans. The problem is that LEDs experience spectral ...
0
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2answers
50 views

USB 5v temp control for stainless steel wire micro heat elenent [closed]

First, I am new to electronics. Is it possible to build a usb or battery powered heating element to heat 1ml of water? How much wire. Needed to hear to 60 deg. c. I need to control temp and also cycle ...
0
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0answers
53 views

Designing a heating element rated for 3kW 240VAC - specs?

I am terribly new to resistance heating, but I understand the general concept. I'm looking to design a heating element using coiled NIC80. If the applied wattage is 3kW and power supply is 240VAC, ...
14
votes
11answers
3k views

Is there a fluctuation effect between heat, resistance and current?

We are told that heat increases a resistor's resistance (or decreases its conductance) and current decreases when resistance is increased. So with less current, less heat would be dissipated, which ...
0
votes
0answers
39 views

A heat resistant connection between power supply and a resistive wire circuit (heat grid)

I'm wondering about methods to isolate thermically from the power source a resistive wire circuit (main function: to heat things). I'm sure there is a non-DIY solution (i.e. "buying something") which ...
1
vote
1answer
41 views

High-Power H-Bridge - Heating Calculation

Background Hi there, I'm using a H-Bridge to drive a thermoelectric cooler (TEC or Peltier) module. I'm not here to discuss control circuitry/drive voltages/slew rates/switching losses, which I know ...
1
vote
6answers
116 views

Can an electric stovetop burner be damaged from prolonged use without cookware on it? [closed]

My partner, who does building maintenance, thinks that it may be possible to damage an electric stove top burner by extended use without a pot or pan because the heating element doesn’t have something ...
0
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1answer
32 views

Compact thermostat for VCO temperature stability

So I have a voltage controlled oscillator with an exponential input made using the THAT2181 VCA IC. The schematic is shown below - the THAT2181 IC is used to change the C4 capacitor charging current ...
2
votes
1answer
103 views

triac burn out problem

I'm working on 2000W furnace controlling with Atmega32a and an optocoupler with BTA40600 triac, my program is designed to heat up the furnace to 850 degree Celsius in one shot (always ON state til ...
1
vote
2answers
62 views

Transistor Power Dissipation / Overheating

I am working on an audio project in which a voltage controlled square wave oscillator drives a 5W 4Ohm Speaker. I am using a unipolar 12V supply. In order to limit the current going through the ...
1
vote
3answers
62 views

Heat Conduction from ceramic resistor to iron rod

I'm trying to conduct a thermal conductivity test. I've set up an experiment where I take a rod of a given material (steel, for example), measure its cross section, length, extreme temperatures and ...
0
votes
0answers
56 views

HL-52S for 1.05kW pool heater and 0.55kW pump

I'd like to create a circuit that can measure my water temperature and based on that turn on or off my pool pump and heater. The heater is a "ECO 5kW" - where it actually uses 1.05kW of power. The ...
0
votes
1answer
59 views

Confusion with resistor and diode voltages when heated in a series circuit

Below there are two circuits supplied by a 10V supply. The only difference is the one on the left is 10k in series with 1k; and the one on the right is 10k in series with a diode. Confusion 1 about ...
1
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3answers
74 views

self-heating effect of dual PT100 temperature probe in a moving mass of water

I'm trying to know how much self-heating should I expect in these conditions: Temperature range: 0-45 C Using a 1050Ohm pullup resistor to feed each PT100 (2-wire configuration) with 5 volt ...
0
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0answers
30 views

Isolation of circuitry from heat source

I'm building an electrolysis unit which will comprise a refractory crucible, containing the electrolyte and the electrodes. The heat will be generated from a furnace to aid the desired reaction. A ...
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votes
3answers
118 views

Does a heat mat need current protection? [closed]

Would any sort of extra circuitry be needed for connecting a heat mat into a power supply? The mat says it draws 4.1A and the power supply can provide 6A, both working at 12V. Will it work as is, or ...
0
votes
1answer
73 views

How to design for electrical connection for a food dryer

I am on this project in building food dryer to dry 2 kg fish cracker maximum per use. Based on the calculation, I only need to use power of approximately 60 watt for the heating to achieve the energy ...
0
votes
0answers
26 views

one mosfet heating in h bridge driver

I have designed H bridge with p and n channel mosfets.These mosfets are driven by npn and pnp bjt connected in push pull config. These transistor are driven by 817 optocoupler. Supply voltage is 12V. ...
0
votes
2answers
56 views

covering sides of LEDS without adding heat

I'm doing a project in which a 5mm LED is near a 5mm phototransistor. There are times in which the sensor must pick up external light even with the LED on. I understand one option is to turn the LEDs ...
3
votes
3answers
516 views

What is the difference between a resistor and a heating element?

As far as I know, a resistor and a heating element are the same thing. But one, the resistor, seems to limit the current in the circuit while the other, the heating element, draws more current and ...
0
votes
2answers
43 views

L293D all inputs high

I want to use the L293D to control 2 motors forward/backward. My question is if I set all inputs (A) high, do I have a short circuit? Because the driver gets really really hot.
0
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2answers
58 views

Can a semiconductor device discharge power capacitors

Trying to figure out how to discharge a capacitor yielding 75 Joule - 177v @ 4700uf. I am uncertain which or even if a semiconductor device is up to the task. Can semis do it? If yes then which can do ...
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votes
2answers
59 views

Powering Waterpump Low Voltage Water Pump from Arduino Micro 5 Volt pin

I'm thinking about powering 3 Low Voltage 5 Volt submersible pump consecutively with an Arduino micro. Those cheap pumps draw 100-200mA and the 5 Volt Pin from the Arduino Micro can supply that (i ...
15
votes
4answers
2k views

Why does only the tip of the electrode melt when arc welding?

I saw on youtube some people performing arc welding with "consumable electrodes". At a first glance, I saw that the current flows through all the electrode and the workpiece and my question comes from ...
0
votes
0answers
33 views

How to calculate the resistance to heat a resistor to a specific temperature [duplicate]

Let's say I'm planning to buy some length of Kanthal-A1 wire. To power it, I have a 120 volt, maximum 20 amp power supply (my wall outlet). That part is okay. The problem is, I want it to be able to ...