Since May 2019, our units of measurement have been defined in terms of stable and experimentally reproducible constants of nature rather than arbitrary and fragile artefacts. This required a completely different experimental approach for defining the unit of mass, the kilogram. The key that made this redefinition practical is the development of precision measurement methods linking quantum phenomena with macroscopic behaviour. One of the officially recognised methods to implement the new kilogramme is a balance based on electromagnetic forces – the Kibble balance. Workshop participants will use a Kibble balance to measure currents and emf (voltage induced by motion in a magnetic field), and calculate weight and mass of an unknown object. The Kibble balance is a showcase for the practical application of basic principles of mechanics and electromagnetism. Students will also practise the use of an oscilloscope for acquiring data.
Syllabus Links: Physics O-Level: Measurement – Physical quantities, units and measurement, Electricity and magnetism – current of electricity, electromagnetism, electromagnetic induction (students should have been exposed to electromagnetic force and induction
|Delivery Type ||Hands-On Workshop |
|Level ||S3, S4, S5, JC1, JC2, ITE, Poly|
|Number of Pax ||10 to 15|
|Duration||2.5 hours |
|Timing ||9.30am or 2.30pm|