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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?
How do manufacturers of resistors indicate the value of the resistance?
They use a color code. Colored bands on the resistor that tell the value. Some precision resistors have their value written on them.
What Transistor to use from 10 ohm to 4 ohm?
We do not use transitors from 4 to 10 ohms. We use resistors.
What resistors do in oscillator circuit?
The same thing they do in every circuit, resist the flow of electricity. That being said there are Many types of ossilators, and they can use resistors for many purposes.
What products use Light Dependent Resistors?
security lights use resistors as the light out side falls the security light turns on and as it gets lighterbout side the light dimms and turns off, in bmw's the resistors are used to detect when the lights should come on as light gets brighter the car lights turn off.
What is the advantage of film resistors over carbon resister?
Film resistors have lower noise than carbon resistors.
Why do people use resistors in an electric circuit?
we use resistors in an electric circuit to describe how a wire works and to control the flow of electricity
What products use resistors?
allmost every electronic devices uses resistors..(it is needed in all circuits)
What does the company called Nesco do?
Nesco is a leading producer of electronic components such as resistors, transistors, relays, and capacitors that are featured on circuitboards for computers, televisions, and smartphones.
5 sentences about you learn to use computers and use computers to learn?
1. You can use computers to learn new things.
Why do you use resistor in electronics?
we use resistors to offer opposition to the flow of electric current. Resistors absorbs power from the circuit and convert it into heat that is why they are normally rated for the maximum amount of power that they can salfely handle
How do manufacturers of resistors indicate the value of the resistance?
They use a color code. Colored bands on the resistor that tell the value. Some precision resistors have their value written on them.
How can you fix a heater and AC fan that only work on high?
Resistors control the speed of the AC/Heater fan. These resistors are switched on and off in various combinations to create the different fan speeds. When the resistors burn out your fan will only work on the "HI" setting. The "HI" setting doesn't use any of the resistors and that's why it works. These resistors are near the blower and the blower is beneath the dashboard on the pasenger side. Just have to located resistors now.
What are those materials of resistors?
most of the resistors commonly used are carbon resistors
What Transistor to use from 10 ohm to 4 ohm?
We do not use transitors from 4 to 10 ohms. We use resistors.
Does Italy use computers?
Italy is a country that does use computers. In this technical age, all developed countries in the world use computers.
How do they use computers in bookstores?
they use computers to keep check of what they sell
What resistors do in oscillator circuit?
The same thing they do in every circuit, resist the flow of electricity. That being said there are Many types of ossilators, and they can use resistors for many purposes.
