example: the 4-ring resistance is: red, yellow, red and gold. the reading is 2700ω=2.7k. the error is ±5%.

example: the 4-ring resistors are: orange, white, red, and silver. the reading is 3900ω=3.9k. the error is ±10%.

example: the 4-ring resistors are: orange, orange, gold and silver, of which orange is 33, multiplied by 10-1=3.9ω, the error is ±10%

example: the 4-ring resistance is: yellow, purple, silver, among which yellow and purple are 47, multiplied by 10-2=0.47ω, the error is ±10%

from the above, you must pay attention when reading the third color ring as gold or silver, because it is the negative number of multiplication, and the resistance value is generally 0.1-9.9ω.