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Through-hole carbon film resistor · YAGEO CFR-25

Resistor (1/4 W carbon film) Working Principle

Learn how Resistor (1/4 W carbon film) works with an illustrated explanation and practical readings.

Resistor (1/4 W carbon film) at a glance

Follow the labeled connections and functional stages

Resistor (1/4 W carbon film) working principle: illustrated functional stages, basic circuit and connections
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How it works

3 stages · Explore one step at a time

Step 1 / 3

Read the colour bands

Four bands: two digits, a multiplier and the tolerance. Brown–black–red–gold is 10 × 100 = 1 kΩ, ±5 %.

Step 2 / 3

Apply Ohm’s law

The current through it is V / R, the same at both ends. In a series chain the voltages add; in a divider the output is Vin × R2 / (R1 + R2).

Step 3 / 3

Check the heat

P = I² × R. The CFR-25 takes 1/4 W up to 70 °C ambient, falling linearly to zero at 155 °C. Above that the film overheats, drifts and finally opens.

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