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Resistors are the most frequently employed passive components. Resistors oppose the current flow in an electrical circuit. When there is a higher level of resistance in a circuit the current flow is little, when the resistance is lowered the flow of current increases. The concept of Ohm’s Law signifies the relation between voltage, current and resistance.
How to deal with resistance and resistors Resistors are the most frequently employed passive components. Resistors oppose the current flow in an electrical circuit. When there is a higher level of resistance in a circuit the current flow is little, when the resistance is lowered the flow of current increases. The concept of Ohm’s Law signifies the relation between voltage, current and resistance. The voltage across a resistor is measured in volts (V), the current through the resistor in amps (A) and the level of resistance is measured in Ohms (Ω). Making use of the Greek letter Ω for ohms avoids the confusion that would be inevitable if we used a capital letter O. The resistance of a resistor and how to write down resistance values Every part of a circuit has some sort of resistance to the flow of current, if we identify a resistor as a circuit component, we mean a part which is manufactured for some reasonably exact resistance value and implemented to manage the volume of current flowing in certain part of a circuit. Resistors are produced with low values (ohm) however electronic circuits normally use higher values of resistance. When large values are written down, the letter M is made use of to indicate ‘million,’ while k refers to ‘thousand” and the necessity to create values like 15,000 or maybe 2,200,000Ω aren't necessary and also the Ω sign may be omitted. Ohms are typically indicated by the letter R. A different method of making values clearer is to use the letters k, M or R instead of a decimal point, because decimal points usually disappear when a page is photocopied. For example it's less difficult to write 16k rather of 16,000Ω and 4M4 instead of 4,400,000Ω in the typical form. A opposition of 1.6Ω would be written as 1R6, and a resistance of 0.53 could be written as 0R53. It's possible to write milli (1/1000th) with the small letter m to point that 5.8 mΩ means 0.0058 ohms. How resistors are marked The value of resistors is marked with numbered markings or color bands. Axial leaded resistors are marked with a number of colored bands. Every single color stands for a number. In the case of a four band resistor, the initial 3 color bands displays the resistor value in ohms and the 4th band shows the tolerance. Resistors may by no means be made to a precise value and the tolerance band (the fourth band in this example) tells us, utilizing a percentage what the margin in resistance is, relative to its coded value. Numerical values with 3 numbers are generally used for SMD resistors coding. The initial two numbers reveal the significant numbers and the 3th number shows a multiply factor in the order of 10. For example a code of 103 suggests: 10 x 10^3 = 10 kOhm.
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