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
hope this helps
ofiu9njkgugi The main function of resistor is to control the electric current passing through the system. In automobile it is used in many areas like Body Areas & Cabin Controls, Integrated Drive Train & Starter/Alternators (including 42V systems), DC/DC Converters, Lighting Supplies, Engine Management & Ignition/Injection System and Hybrid/Electric Vehicle.
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 hope this helps
OBVIOUSLY a 1 ohms resistor will show as zero for all the higher scale except for the low range
Wheatstone bridge is used to calculate the resistance of unknown resistor in the circuit.
A cement resistor is typically used as a power resistor (a resistor whose power rating is greater than 1 W).
A series dropping resistor is a resistor that limits the amount of current flow in a circuit.
The first 3 band on a resistor indicate the value of that resistor.
It slows down the speed of the electrons , which are all passing through the resistor
OBVIOUSLY a 1 ohms resistor will show as zero for all the higher scale except for the low range
the sensistor functions as a temperature sensitive resistor with a positive coefficient of temperature.used for temperature compensation in various circuits
Wheatstone bridge is used to calculate the resistance of unknown resistor in the circuit.
yes, a variable resistor
Otis F. Boykin invented the wire precision resistor and the electrical resistor.
A cement resistor is typically used as a power resistor (a resistor whose power rating is greater than 1 W).
The purpose of colored bands on a resistor is to tell whoever is installing the resistor the amount of resistance that particuliar resistor has.
Resistor value is defined by the Resistance the resistor offers in Kilo ohms/ohms value given by color codes on the resistor.
A non-ohmic resistor doesn't have a constant resistance. A ohmic resistor has a constant resistance.
The alternator does not have a resistor.The alternator does not have a resistor.
It does not have a ballast resistor.It does not have a ballast resistor.