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Conceptual understanding: generation of electricity relies on the electromagnetic relationships.
Conceptual understanding: generation of electricity relies on the electromagnetic relationships.
Electricity is usually generated as ac but we can change its form.
Electricity is usually generated as ac but we can change its form.
Knowledge:
Knowledge:
11.1 - Electromagnetic Induction
- Electromotive force (emf)
- Magnetic flux and flux linkage
- Faraday's law of induction
- Lenz's law
11.2 - Power generation and transmission
- Alternating current (ac) generators
- Average power and rms values of voltage and current
- Transformers
- Diode bridges
- Half wave and full-wave rectification
11.3 - Capacitance
- Capacitance
- Dielectric materials
- Capacitors in series and parallel
- Resistor Capacitor (RC) series circuits
- Time constant
Applications and skills:
Applications and skills:
11.1 - Electromagnetic Induction
- Describing the production of an induced emf by a changing magnetic flux and within a uniform magnetic field
- Solving problems involving magnetic flux, magnetic flux linkage and Faraday’s law
- Explaining Lenz’s law through the conservation of energy
11.2 - Power generation and transmission
- Explaining the operation of a basic ac generator, including the effect of changing the generator frequency
- Solving problems involving the average power in an ac circuit
- Solving problems involving step-up and step-down transformers
- Describing the use of transformers in ac electrical power distribution
- Investigating a diode bridge rectification circuit experimentally
- Qualitatively describing the effect of adding a capacitor to a diode bridge rectification circuit
11.3 - Capacitance
- Describing the effect of different dielectric materials on capacitance
- Solving problems involving parallel-plate capacitors
- Investigating combinations of capacitors in series or parallel circuits
- Determining the energy stored in a charged capacitor
- Describing the nature of the exponential discharge of a capacitor
- Solving problems involving the discharge of a capacitor through a fixed resistor
- Solving problems involving the time constant of an RC circuit for charge, voltage and current
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