1. How to properly read resistor? 2. How does resistor power (ohms) affect the circuit? Answered
How do you read resistor color bands? I'm messing around with 5 band resistors in my circuit, and I realized I didn't have any 330 ohm resistors... I was surprised because the kit said they were 330 ohms. Little did I know that a lot of resistors have a different value if read backwards, for example, red, red, black, brown, brown could be 2.2k Ohms or 11k Ohms, depending on which way you read it. How do you know their orientation? Second question: How do resistors affect the circuit? Vague question, I know, but I'm utterly confused right now. My blue LED is supposed to have a current of 20mA, which with a 9V battery demands a 275 Ohm resistor... But the circuit works with a 10K Ohm resistor or a 100 Ohm resistor... I thought smaller resistors were less restricting and larger resistors were more restricting. But if the higher Ohm resistor is more restricting, should a wildy high Ohm resistor prevent the circuit from working? Because the LED doesn't fade in luminosity until I get to a 100K Ohm resistor, which makes me question what a resistor does if the circuit works with a 100 Ohm resistor or a 100K Ohm resistor?