Resistor 0.25W 20 ohm (10 pcs)

The Resistor 0.25W 20 ohm is a through-hole fixed resistor with a resistance of 20 Ω and a 0.25 W rating, supplied in a pack of 10. Its round value makes Ohm's law easy (1 V across it means 50 mA), so it is useful for current sensing, constant-current sources, gate resistors and classroom experiments.

Resistor 0.25W 20 ohm Specifications

• Resistance: 20 Ω (20 ohms)
• Power rating: 0.25 W (1/4 W)
• Value series: standard E24 value
• Colour code: red, black, black (4-band) or red, black, black, gold (5-band), followed by the tolerance band
• Maximum current: about 112 mA at the full 0.25 W
• Type: fixed resistor, axial leads, through-hole
• Pack size: 10 pieces

Resistor 0.25W 20 ohm Applications

• Simple current sensing: every 10 mA gives a 200 mV drop
• LM317 constant-current source: 1.25 V / 20 Ω gives 62.5 mA
• Gate resistors for MOSFETs switched from a microcontroller
• Ohm's law and power experiments in electronics classes
• Prototyping on breadboards and perfboards

What's in the Box

• 10 × 20 Ω 0.25 W resistors

Tip: Two 20 Ω resistors in parallel make an exact 10 Ω part that can handle 0.5 W, a quick fix when you need a little more power than a single quarter-watt resistor allows.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.