← All parts

Resistor 100 Ω (1/4W)

Resistor

Carbon film resistor. Used to limit the current through LEDs; it makes an LED brighter but lets more current through: about 30 mA through a red LED at full brightness on 5V. Suits LEDs dimmed with PWM or low voltages.

Specifications

Resistance

100 Ω

Colour code

Brown - Black - Brown - Gold

Tolerance

±5%

Power

1/4 W (0.25W)

Type

Carbon film

Typical use

LED current limiting (~30 mA at 5V, less with PWM)

Shop prices

• HatfonPack of 25 · In stock4.59 ₺
• Direnc.netIn stock0.20 ₺
• RobotistanPack of 50 · In stock10.00 ₺
• MotorobitPack of 10 · In stock2.53 ₺
• RobotsepetiPack of 10 · In stock3.05 ₺
• HobiDevreIn stock0.48 ₺
• RobocomboIn stock0.50 ₺
• F1 DepoOut of stock0.25 ₺
• Robolink MarketPack of 10 · Out of stock6.00 ₺
• Modül ElektronikPack of 10 · Out of stock24.85 ₺

Prices read from the shops' pages on 22 October 2026. Prices and stock may have changed since; check at the shop before you buy.

Projects with this part

• Night Light (LDR)Beginner20 minA night light that turns itself on as the room gets dark. An LDR (light sensor) and a 100 kΩ resistor form a voltage divider; the Arduino reads the light level on pin A0 and, in the dark, dims the LED on pin 9 with PWM. It teaches analog reading, thresholds and PWM. No extra library needed.Open project