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Topic 11: Electromagnetic induction
Topic Area
You must know
;
You should be able to
:
Before
After
That there is a magnetic flux in a region where there is a magnetic fi eld
What is meant by flux linkage
That magnetic flux density is equivalent to magnetic fi eld strength
That an electromotive force (EMF) is induced in a conductor when it moves relative to a magnetic fi eld or when there are changes in the magnetic flux
that links the conductor
Lenz’s law and Faraday’s law of induction
Describe how the induced EMF arises when a magnetic flux changes and when a conductor moves relative to a uniform magnetic fi eld
Solve problems that include the use of Faraday’s law of induction and magnetic flux and magnetic flux linkage changes
Explain how conservation of energy leads to Lenz’s law
Explain that the magnitude of the induced EMF depends on the change in magnetic flux linkage
What is meant by an alternating current generator
The meaning of average power and root mean square values for current and voltage
What is meant by a step-up and step0down transfomer
What is meant by a diode bridge
What is meant by full-wave and half-wave rectifi cation
How to describe qualitatively the effect of adding capacitance to a diode-bridge rectifi cation circuit
Explain the operation of an alternating current (AC) generator including changes of generator frequency
Solve problems involving average power and problems involving root mean square (RMS) and peak currents and voltages in AC circuits
Describe the use of transformers in the transmission of AC electrical energy
Investigate diode bridge rectifi cation circuits experimentally
Solve problems involving step-up and step-down transformers
What is meant by capacitance
What is meant by dielectric material
How capacitors combine in series and parallel
The properties of a resistor-capacitor (RC) circuit
What is meant by the time constant of an RC circuit
How to solve problems involving the discharge of a capacitor through a fi xed resistor
How to solve problems for charge, current and voltage involving the time constant of an RC circuit
Solve problems involving parallel-plate capacitors
Describe the effect of dielectric materials on capacitance
Investigate the combinations of series and parallel capacitor circuits
Describe the charging process for a capacitor in series with a resistor
Determine the energy stored in a charged capacitor
Describe the nature of exponential discharge of a capacitor through a resistor
11.1 Electromagnetic
induction
11.2 Power generation
and transmission
11.3 Capacitance
