Cambridge IGCSE Physics4.5 Electromagnetic effects Checklist
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What's on this checklist
Core
- I know that an e.m.f. can be induced in a conductor when the conductor moves across a magnetic field, or when a changing magnetic field links with the conductor.
- I can describe an experiment that demonstrates electromagnetic induction.
- I can state the factors that affect the magnitude of an induced e.m.f.
- I can describe a simple a.c. generator (rotating coil or rotating magnet), and the use of slip rings and brushes where they are needed.
- I can describe the pattern and direction of the magnetic field caused by currents in straight wires and in solenoids.
- I can describe an experiment to find the pattern of the magnetic field (including its direction) caused by currents in straight wires and in solenoids.
- I can describe how the magnetic effect of a current is used in relays and loudspeakers, and give examples of their applications.
- I can describe an experiment that shows a force acting on a current-carrying conductor in a magnetic field, including the effect of reversing:a)the currentb)the direction of the field
- I know that a current-carrying coil in a magnetic field may experience a turning effect, and that the turning effect is increased by increasing:a)the number of turns on the coilb)the currentc)the strength of the magnetic field
- I can describe how a simple transformer with a soft-iron core, as used for voltage transformations, is constructed.
- I can use the terms primary, secondary, step-up and step-down.
- I can recall and use the equation Vp/Np = Vs/Ns, where p and s refer to the primary and the secondary.
- I can describe how transformers are used in the high-voltage transmission of electricity.
- I can state the advantages of high-voltage transmission.
Extended
- I know that the direction of an induced e.m.f. opposes the change that causes it.
- I can state and use the relative directions of force, field and induced current.
- I can sketch and interpret graphs of e.m.f. against time for simple a.c. generators, and link the position of the generator coil to the peaks, troughs and zeros of the e.m.f.
- I can state, qualitatively, how the strength of the magnetic field varies around straight wires and solenoids.
- I can describe how changing the magnitude and direction of the current affects the magnetic field around straight wires and solenoids.
- I can recall and use the relative directions of force, magnetic field and current.
- I can work out the direction of the force on beams of charged particles in a magnetic field.
- I can describe how an electric motor works, including the action of a split-ring commutator and brushes.
- I can explain the principle of how a simple iron-cored transformer works.
- I can recall and use the equation for a transformer with 100% efficiency, IpVp = IsVs, where p and s refer to the primary and the secondary.
- I can recall and use the equation P = I²R to explain why power losses in cables are smaller when the voltage is greater.