Power of chip resistor

The normal work of the chip resistor will not burn out the power as the rated power, the actual power consumed by the resistor is the power consumption, which is usually only 1/2 of the rated power or slightly larger. The rated power of the resistor has also been serialized, and the nominal value is usually 1/8, 1/4, 1, 2, 3, 5, 10W, etc.

When the resistor is damaged and needs to be replaced, in addition to the same resistance value, attention should be paid to the power requirement. It can be roughly judged according to the size of the resistor. Generally, large resistors have higher power. If the power is not enough, you can use two resistors in parallel to use, but you should pay attention to and combine the actual resistance value to be the same as the original resistance value.

In a regular circuit diagram, if the resistor has no power mark, it means that it is a resistor with a smaller power requirement. Generally, a 1/8W resistor can be used. Sometimes some unit symbols are omitted in order to save location. The identification method is:

When the resistance is in the range of 1-999R, the unit R is omitted and only numbers are indicated. If marked as "R2/330", it means that R2 is 330R.

When the resistance is 1KR-1MR, the unit is generally expressed by K. If marked as "R2/5K6", it means that R2 is 5.6R.

When the resistance is above 1MR, the unit is omitted, and a decimal point and 0 are added after the marked number to indicate megaohms. If marked as "R2/2.0", it means that R2 is 2MR.