Resistor

1. Resistor

Type of resistor

• Unit in Ohm (Ω)
• R1, is the normal resistor, while 10k is it's value.
• PR1, The one with arrow is called: Potentiometer 可变电阻 / 电位器

• For PCB we use SMD Resistor instead of normal resistor.

Value reading of resistor

a. Normal Resistor

INFO

• Red = 2
• Red = 2
• Black = ×1 (multiplier)
• Gold = ±5% (tolerance)

22 × 1 = 22 Ω ±5% Resistor

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• Yellow = 4
• Purple = 7
• Black = 0
• Gold = 0.1 (multiplier)
• Brown = ±1% (tolerance)

470 x 0.1 = 470 Ω ±1% Resistor

• Gold and Silver ring will never be the first reading.

b. SMD Resistor

1. 3 Digit Reading ±5% (tolerance)

• First 2 Digit means the effective value
• Last Digit means 10^n
• ±5% (tolerance)

Example Resistor:

104

Value:

10 * 10^4 = 100,000Ω (100kΩ) ±5% (tolerance)

2. 4 Digit Reading ±1% (tolerance)

• First 3 Digit means the effective value
• Last Digit means 10^n
• ±1% (tolerance)

Example Resistor:

5112

Value:

511 x 10^2 = 51,100Ω (51.1kΩ) ±1% (tolerance)

3. SMD Resistor with R

R means 0.x

Example Resistor:

R010

Value:

0.01Ω