Copper resistors are by no means simple “conductive components”—their core value stems from their resistance-temperature characteristics and low resistivity advantages, which together underpin their applications across multiple fields.

They serve three core functions:

– **Temperature sensing**: Converting temperature into electrical signals;

– **Energy transmission**: Acting as “conductive bridges” to reduce circuit losses;

– **Circuit regulation**: Providing customized impedance solutions.

In medium-to-low temperature scenarios, they are the mainstay for temperature measurement. Common models include Cu50 (50Ω at 0℃) and Cu100 (100Ω at 0℃). Boasting excellent linearity and low cost, they are widely used in industrial settings such as -50℃~150℃ temperature monitoring for chemical reactors and food cold storage, as well as in civilian scenarios like computer room constant temperature systems and home appliance temperature probes.

From households to power grids, the low-loss property of copper resistors is indispensable. They also play an irreplaceable role in basic electronic circuit units such as PCB boards and high-frequency communication fields. Their low cost, reliable performance, and wide adaptability make them irreplaceable in current application scenarios.

Below are the sample preparation parameters for copper resistance materials and an appreciation of metallographic microscopic effects:

1️⃣ **Grinding**: Sandpaper with grit sizes P800-P1200-P2500

2️⃣ **Rough polishing**: SC + 3μm polycrystalline diamond

3️⃣ **Final polishing**: ZN + 0.05nm silica

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