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Start Date

8-5-2020 12:00 AM

Document Type

Oral Presentation

Department

Physics

Advisor

Paul Nakroshis, PhD

Abstract

Redefining the kilogram using electricity has been one of the most intriguing advances in measurement science in the last century. To do this, an electromagnet is used to balance the force of gravity imposed on a mass in a standard balance setup, the current through the electromagnet is measured and this value is used to define a kilogram, this is called a watt-balance. We use this concept to create a watt-balance using a TeachSpin Torsion Pendulum, where in we were able to measure masses of several sizes with excellent precision and accuracy. We compare the efficacy of our scale to that of conventional weighing methods, and consider ways of improving this device to make it more suitable for lab environments.

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May 8th, 12:00 AM

Constructing a Watt-Balance with a Torsion Pendulum

Redefining the kilogram using electricity has been one of the most intriguing advances in measurement science in the last century. To do this, an electromagnet is used to balance the force of gravity imposed on a mass in a standard balance setup, the current through the electromagnet is measured and this value is used to define a kilogram, this is called a watt-balance. We use this concept to create a watt-balance using a TeachSpin Torsion Pendulum, where in we were able to measure masses of several sizes with excellent precision and accuracy. We compare the efficacy of our scale to that of conventional weighing methods, and consider ways of improving this device to make it more suitable for lab environments.

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