Demonstration of the principle on which the ampere is based To show electromagnetic induction, thus demonstrating Faraday’s law Demonstration of Lenz’s law Demonstration of electromagnetic damping To show a.c. and d.c. using an oscilloscope Compare peak and rms values of alternative currents and voltages Demonstration of mutual induction Demonstration of a transformer Demonstration of self-induction
SCIENCE,TECHNOLOGY AND SOCIETY: Earth’s magnetic field—use in navigation Electromagnets and their uses Applications of current in a magnetic field (motors, meters and loudspeakers) Electromagnetic damping Application of electromagnetic induction in generators National grid and a.c. Uses on transformers (mobile phone chargers) Uses on inductors (dimmer switches in stage lighting)
PHYSICAL QUANTITIES INTRODUCED IN THIS CHAPTER: Quantity
rms value of alternating emf peak value of alternating emf rms value of alternating current peak value of alternating current magnetic flux density magnetic flux