Contents
Should resistor be hot?
According to a Yaego datasheet for metal film resistors, resistors can be operated at 100% of their rated load at an ambient temperature of 70C or lower. You don’t need to derate to 50% until ambient temperature is over 100C. The derating depends heavily on the resistor type and specs.
How do you keep a resistor cool?
If you really want to run things cooler then you’ll need heat sink mounted resistors and have a fan blowing on the fins of the sink. Actually the fan is optional, you could depend on natural convection. But if you’re that concerned about the amount of heat then the heat sink is the way to go.
Is it bad if a resistor gets hot?
Burning of Resistor When a resistor has been overloaded with voltage exceeding its power rating, the resistor will become very hot to touch, darken considerably and possibly even melt or catch on fire. Although a resistor may appear damaged at this point, it can still be functioning.
Is it normal for LED resistors to get hot?
These resistors get very hot when under constant load but for a turn signal, it won’t get as hot – still, securing to a metal surface is critical.
Why does my led resistor get so hot?
Dig out a datasheet for the resistor and see how hot it is expected to get if you actually were to have it dissipate 1/4 W. That would probably be in the 150-200°C range. Even at 150°C for 250 mW, and assuming 20°C for ambient, you have 130°C / 250 mW = 520°C / W. 60 mW would therefore heat the resistor 31°C, which you can definitely feel.
Why does a 60 MW resistor get warm?
Even at 150°C for 250 mW, and assuming 20°C for ambient, you have 130°C / 250 mW = 520°C / W. 60 mW would therefore heat the resistor 31°C, which you can definitely feel. If starting at 20°C, then the resistor would be at 51°C, or 124°F. So it makes perfect sense that it would feel “warm” or almost “hot” to you.
How does a resistor affect the temperature of a room?
That power has to be taken up by the surroundings via conduction, convection and/or radiation. The temperature that the resistor attains depends on how quickly you can remove the heat, i.e. the faster you can cool it, the lower the temperature. If you have a huge fan blowing on the resistor you might not even feel a temperature rise.
Why does a current flow through a resistor?
A resistor is defined by Ohm’s Law, which states that V= IR, so a current flowing through a resistor HAS to cause a voltage to be developed across it. And we also know that power = V x I, so a current flowing through a resistor MUST dissipate power.