The value of a resistor is usually determined by the color code of the resistor. If the resistor is physically too small to print the numbers on the body, then you will get the numbers using the color-coded ribbon printed on the body that shows the ohmic value. While the number of watts is determined from the shape of the physical size. The following is a table of the resistor color code.
Ways to remember color codes:
Hi Co Me O Ku Hi Bi U A P
0 1 2 3 4 5 6 7 8 9
The ribbon reads from left to right.
Example:
Resistor has 4 color bands as follows: Red, Purple, Orange, Gold. Determine the ohmic value using the resistor color code.
R = 27 x 103 5%
= 27 000 or
= 27 k ohms 5%
Then this resistor has a nominal value of 27 k ohms with a tolerance of 5%. Tolerance means that in fact the resistor can have a maximum value.
Rmax = 27 k ohms - 5% of 27 k ohms
= 25 650 ohms or
= 25.65 k ohms
The fact that the hanging value is 27000 ohms. If there is a question about the value of this resistor, we can say 27000 ohms or 27 k ohms, regardless of tolerance.
Tolerance is important, but nevertheless a practical picture of when to replace a resistor is wrong
Komentar
Posting Komentar