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How do you tell what resistor is what?
Some resistors have contact plates on the bottom. Read the 3 or 4 numbers on the resistor. The first 2 or 3 represent the significant digits and the last indicates the number of 0s that should follow. For example, a resistor reading 1252 indicates a rating of 12,500 ohms or 1.25 kilo-ohms.
How do you identify the color code of a resistor?
Reading and Determining the Resistor Value Hold the resistor with the gold or silver band to the right and read the color codes from the left to the right. Select the color codes from the bands on the resistor. Read the colors from left to right. The resistance value based on the color code provided is now displayed.
How do you calculate a 2.2 K resistor?
Thus, for 2.2k ohm resistor, 1st digit is ‘ 2 ‘, ∴ look for color in a chart with value 2, then it’s your 1st color(say red). The next 2nd digit is ‘ 2 ‘, ∴ look for color in a chart with value 2, then it’s your 2nd color (say red).
What are examples of a resistor?
Laptop charger. Mobile phone charger. Fan Speed Controller [Potentiometer] All of us are familiar with the rotating knob that is used for controlling the fan speed. Lightning bulb (Carbon / Metal film) The electronics circuits in CFL, LED and other lightning lamps contain resistors.
What is the scientific definition of resistor?
Resistor is defined as A passive electrical component with two terminals that are used for either limiting or regulating the flow of electric current in electrical circuits. The main purpose of resistor is to reduce the current flow and to lower the voltage in any particular portion of the circuit.
Why are resistors needed?
Why do we need Resistors. In an electronic circuit, the basic function of a resistor is to limit the current to a safe value so that the associated sophisticated parts can function properly.
How do you calculate current through a resistor?
Calculating the current through a resistor is one of the first elements learnt in basic circuit analysis. Ohm’s Law states that the current is equal to the voltage divided by the resistance. So the current through any resistor can be found by dividing the voltage across that resistor by its resistance.