Why manganin is used for making standard resistor?

Lochan Chandra Gupta    June 25 2022 02:19:24 PM

Manganin is used to make standard resistor, because it has high resistivity and negligible effect of temperature on it.

Shruti Gond    June 16 2025 01:43:31 PM

Okay, so manganin is used for making standard resistors mainly because of its very low temperature coefficient of resistance.

That means its resistance doesn't change much even when the temperature changes, which is super important for accurate measurements.

If a resistor's value kept changing with temperature, it wouldn't be reliable. Manganin is also stable over time and doesn't corrode easily, so it's great for making resistors that need to stay accurate for a long time.

Plus, it's easy to shape and work with when making precise components. So overall, manganin helps standard resistors stay consistent, reliable, and long-lasting.

Shivani Yadav    June 16 2025 01:48:03 PM

Oh hey, jumping in here — so yeah, another big reason manganin is used is because it has pretty high resistivity, which means you can make a resistor that's not too big but still has the resistance you want.

Also, it doesn't produce a lot of thermal emf when it's connected with copper, which is useful in circuits where you're measuring tiny voltages.

Basically, it keeps things super accurate and stable, which is exactly what you need in a standard resistor.

Arpita Singh    June 16 2025 01:49:12 PM

Yeah, so the main thing about manganin is that it's really good at keeping its resistance steady even if the temperature goes up or down.

That makes it perfect for standard resistors because you want the resistance to stay the same no matter what. Also, it doesn’t oxidize or wear out easily, so it lasts a long time without changing its properties.

That’s super helpful when you’re doing precise measurements and need consistent results every time.

Arpita Singh    June 16 2025 01:50:26 PM

Oh yeah, manganin is actually pretty cool for this.

It’s used in standard resistors because its resistance barely changes with temperature, which means you get really accurate and consistent readings.

That’s super important when you're using it in labs or instruments where precision matters. Plus, it doesn’t react much with air or moisture, so it stays stable for a long time.

That’s why it’s the go-to material for making resistors that need to be reliable.