Asked in Ford Explorer Eddie BauerElectronics Engineering
Ford Explorer Eddie Bauer
Why do resistors heat up?
September 29, 2009 10:47PM
Resistors heat up for the same reason that any device that uses energy heats up.
If you pass current (amperes) through a resistor, the power across that resistor (watts) is voltage times current. That power must go someplace, so it makes heat.
Asked in Electronics Engineering, Chemistry, Energy
Why does a circuit warm up when it has electric current flowing in it?
Asked in Definitions, Education
What is a Heat Anticipator?
A Heat Anticipator is really a potentiometer connected to (possibly) two resistors. You may see these resistors behind a mechanical thermostat "coil". When the heater is running, current flows and heats up the resistors, making the heater turn off a little early so that it doesn't overshoot the temp you have set. If the pot is set at it maximum resistance, the resistors heat less, it just makes sense. Check your manual on your thermostat for proper settings.
Why do resistors often have a safety factor of 2 in regard to their power rating?
That might be done if the resistor is in a restricted space where the air flow is limited. You need heat sinks to keep the resistors from burning up. A long time ago, I used resistors "to specs", and they burned up in a week. So I used "10x specs", and they burned up in a month. Finally, I waterproofed the resisters and dumped them in a pail of water (a big heat sink) -- that worked. (Not to be recommended, however.)
How many watts does a 220 ohm resistor have?
The watt rating of a resistor is directly proportional to their physical size. Resistors generate heat just like any resistive load. Small resistors usually are rated at 1/4 watts, larger resistors about 1/4 in diameter have a 2 watt heat dissipation capacity. Ceramic wire wound resistors are wound on a tube form so that there is more surface area and cooling air can pass up through the tube. These types of resistors can dissipate up to 50 watts of unwanted heat. <<>> None. Resistors do not have watts. Watts, ohms, amps, volts, farads... are all ways to measure electrical properties, and while there are interrelations, watts refer to the total amount of energy that a device consumes or produces.
What is range of wire wound resistors?
Asked in Electronics Engineering, Physics
What form of energy do most resistors convert electrical energy into?
Asked in Electrical Engineering
What would happen to the power dissipated in the voltage divider?
'Power dissipation' in a voltage divider describes the rate at which energy is transferred from the resistors to the surrounding atmosphere through heat transfer, due to the work done on the resistors by the current flowing through them. If the work done on the resistors causes their temperature to increase faster than heat transfer takes place (a function of the surface area of the resistors), then they will overheat and, possibly, burn out.
Asked in Electronics Engineering
What are pull up and pull down resistors?
Pull-up resistors are resistors which are used to ensure that a wire is pulled to a high logical level in the absence of an input signal.Pull-up resistors are resistors used in logic circuits to ensure a well-defined logical level at a pin under all conditions. Pull-down resistors work in the same manner as pull-up resistors, except that they pull the pin to a logical low value. They are connected between ground and the appropriate pin on a device. A pull down keeps the base at ground until the switch closes, which connects the base to Vcc. again without a short.
Asked in Physics, Solid State Physics, Batteries
What effects does temperature have on resistors and semiconductors?
Firstly a general rule: Too hot fries anything. (and lesser important: too cold and you get superconduction) Resistors For normal resistors: as temperature increases, the electrical resistance decreases. Though specially made heat sensitive resistors with the opposit effect (for temperature measurements) do exist.
Where are the resistors located which control heater fan motor speed on a 1996 Chevy Express Van?
Asked in Ford Explorer Eddie Bauer
Why do you use resistor in electronics?
Asked in Modification of Old Electrical Work
How many watt values are there for resisters?
Some of the more common values are 1/8, 1/4, 1/2, 1 and 2 watts. On PC boards the larger resisters are not placed adjacent to the board but connected into the board above the board using standoffs. This is to let air circulate around the resistor to carry away the heat generated by the resistor. The physical size of the resistor reflects the resistors ability to dissipate the heat which builds up inside the resistor. As the wattage goes up so does the physical size of the resistor. Resistors that dissipate very large amounts of power (watts) are usually wire-wound resistors. Wire-wound resistors can be as high as 100 watts.
Does the size of a resistors make a difference in proving ohm's law?
Nope, resistors all the way from 0 ohms through 100 megohms come in the same package size(s). Different package size depends on power rating of the resistor, high wattage resistors must be much larger than low wattage resistors to allow them to dump the heat and not burn out. Some very high wattage resistors even have plumbing fitting attached so that refrigerated cooling water may run through their outer case to help remove heat!
Asked in Science
What two forms of energy that resistors can give off?
Would the resistances be effected if the voltage in a parallel circuit was to tripled?
Asked in Science
What is the two forms of energy that resistors can give off?
Asked in Science, Circuits, Toaster Ovens
Does a toaster have a resistor?
Look inside the toaster when it is toasting. The wires that go back and forth and glow red during toasting are resistors, there is one of these wire resistors on each side of each slot to provide the heat that does the toasting. The wire of these resistors is made of an alloy called Nichrome, made of Nickel and Chromium, that has relatively high resistance. Nichrome is also used in wirewound resistors in electronic devices.