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Recognition and Measurement of Electronic Components

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In this video, we mainly learn about resistor identification and resistor units

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Resistor is a substance that hinders the flow of electricity

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Current can be understood as water flow,

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and resistor can be understood as hydroelectric stations built in rivers,

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such as the Three Gorges Dam

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It can be understood as a resistor

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Because these hydroelectric stations will hinder the flow of water

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Common resistor types are chip resistors, color ring resistors

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The common resistors in mobile phones are chip resistors, and the resistor is very small

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Color ring resistors are generally used in large electrical components,

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such as air-conditioning circuit boards,

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desktop power supplies, lapto adapters, etc.

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The role of resistor

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In the circuit board, resistors mainly play the role of current limiting, current dividing, and voltage dividing,

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and also have the function of converting electrical energy into internal energy

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The function of converting internal energy is not very common in mobile phone circuit boards,

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but it is more common in daily life

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For example, a small solar heater used in winter, after the power is turned on,

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there will be a wire inside the heater that glows red and becomes hot

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The wire is actually a resistive wire made of a material that resists the flow of electricity

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After electrification, when the current flows through the resistor wire,

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heat will be generated

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Resistor code

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Resistors are identified by the letter R in the schematic diagram,

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resistors in parallel are identified by RN or RP

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In the mobile phone circuit board, there are almost no resistors in parallel,

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and small chip resistors are used

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The resistor in the mobile phone is relatively small,

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and there is no obvious mark on it

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When identifying, you can use the schematic diagram, position diagram or number to determine

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For example, in the schematic diagram, R15001 represents a resistor

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The unit of resistor is ohm, and 惟 is used to identify

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The conversion relationship of resistor is

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1G惟=1000M惟

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1M惟=1000K惟

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1K惟=1000惟

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In the mobile phone circuit board, most use the kiloohm resistor or ohm resistor

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Ok, that's it for this video