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Resistance: Electrical resistance describes how an electrical conductor (a wire) opposes the flow of an electrical current (flow of electrons). To overcome this opposition a voltage (a energy) must dropped (used) across the conductor (wire). Resistance can be described by ohms law: Ohms Law: R = V / I (Resistance = Voltage / Current) (resistance measured in ohms) where: Voltage [V]= the energy lost across an component (voltage measured in volts). Current [I] = the charge (electrons) flowing through an component (current measured in Amps). Electrical resistance can be thought of as sticking your hand out a car window. The faster [current] you drive the harder the wind presses [resistance] against you hand and therefore it takes more energy [voltage] to hold your hand steady. When trying to overcome electrical resistance, the electrical energy lost is turned into heat. This is how the elements of a household stove, toaster, and fan heater work. Because of the vacuum in a light bulb, the electrical energy lost is instead turned into light. It can be seen the electrical resistance plays a large role in modern life. Resistor: The resistor is the most common electronic component and is used to limit and/or control the voltage and current in an electronic circuit. Resistors are carefully manufactured to provide a predetermined value of electrical resistance which may range from 0.1 ohms to 100,000,000 ohms, depending on the application. The physical size of a resistor also varies dependant on the amount of power passing through the resistor, given by: P = V x I (Power = Voltage x Current) (power measured in watts) There are also many types of resistors including: · Variable Resistor - changes resistance when its shaft is rotated (volume knob on a stereo). · Thermistor - changes resistance when the temperature changes (used in a thermostat). · Light Dependant Resistor (LDR) - changes resistance when the lighting changes (used in children's night-lights). Resistor Example: An LED is a small red light (such as the one on the front of most TVs) and requires 2.0 volts and 0.02 amps to operate correctly. If we connected that LED up directly to a 12 volt battery, the voltage would be too high, and too much current would flow… the LED would blow up. We need to use a resistor to limit the voltage and current. But which value of resistance should the have resistor? Uses ohms law: R = V / I = (12.0 - 2.0) / 0.02 = 500 ohms (Note: the voltage across the resistor is the battery voltage minus the voltage we want across the LED) But which value of power should the resistor be capable of handling? P = V x I = (12.0 - 2.0) / 0.02 = 0.2 Watts
What else can I help you with?
When will the resistance of a resistor be numerically equal to its resistivity?
The resistance of a resistor will be numerically equal to its resistivity when the resistor's dimensions (length and cross-sectional area) are such that the resistance ( R ) is calculated using the formula ( R = \frac{\rho L}{A} ) and the units align accordingly. Specifically, this occurs when the length ( L ) of the resistor is equal to its cross-sectional area ( A ). In such a case, ( R ) would equal ( \rho ) if they are expressed in compatible units.
How do you change blower resistor for citroen xsara Picasso?
you have to remove the frot cover,and so you can see the two units
What are specifications of resistor?
The resistance, the precision of that value, the thermal or electrical environment, the style of indicating these values. There are wire-wound resistors, cracked carbon resistors, carbon resistors and so on.
Is Light dependent resistor an example of resistor?
yes, a variable resistor
Why would 1990 fifth avenue gauges quit?
i got this from carfaxRecall date: Not reported Units potentially affected: 7,600 NHTSA campaign number: 86V028000 Defective part or component: ELECTRICAL SYSTEM:INSTRUMENT PANEL:CLUSTER MODULEDescription: A RESISTOR IN THE ELECTRONIC PANEL CLUSTER MAY BE SUBJECTED TO AN ELECTRICAL CURRENT OVERLOAD DUE TO FAILURE OF A SWITCHING TRANSISTOR. CONSEQUENCE OF DEFECT: THE OVERHEATED RESISTOR COULD IGNITE AND START AN INSTRUMENT PANEL FIRE. MODIFY INSTRUMENT PANEL CLUSTER BY REPLACING THE RESISTOR WITH A FUSED RESISTOR THAT WILL NOT IGNITE IF OVERLOADED.
How do you replace the resistor on the blower motor of a 2002 Pontiac grand am. The fan works are on higher speeds only Does not work on low speeds?
On many units the resistor is located in the heating system plenum. Look under the dash on the passenger side. If you see a fixture with a plug on it with 2 or 4 screws holding it into the plenum remove the fixture and inspect. If it has 2 or 3 heavy , bare wire coils between the terminals that's the resistor assembly. On some vehicles the blower motor has a couple of different windings that are switched in and out to change fan speeds. On still other units the motor has an electronic module that controls the speed located in the dash panel. I'd bet on a '02 Pontiac that it uses a resistor in the plenum.
What is the difference between an ohmic resistor and a non-ohmic resistor?
A non-ohmic resistor doesn't have a constant resistance. A ohmic resistor has a constant resistance.
What is the function of a cement resistor?
A cement resistor is typically used as a power resistor (a resistor whose power rating is greater than 1 W).
What are resistor values defined by?
Resistor value is defined by the Resistance the resistor offers in Kilo ohms/ohms value given by color codes on the resistor.
Who invented the resistor?
Otis F. Boykin invented the wire precision resistor and the electrical resistor.
Where is the resistor for the coil on a mercruiser 470?
The Cable is the Resistor ! Its a Resistor-Cable ! Greets from the Lake of Constance/Germany !
Where would you find a material which is a resistor?
Where would you find a material which is a resistor? You can find a resistor material in Europe
