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Curriculum
Physics
KS5 Physics Rota
KS5 Electromagnetism
KS5 Electromagnetism
Back to Teaching Rota
Electromagnetism - Objectives
Conten
Content
Force on a current-carrying wire in a magnetic field: F = BIl when field is perpendicular to current.
Fleming’s left hand rule.
Magnetic flux density B and definition of the tesla.
Force on charged particles moving in a magnetic field, F = BQv when the field is perpendicular to velocity.
Direction of force on positive and negative charged particles.
Circular path of particles; application in devices such as the cyclotron.
Magnetic flux defined by φ = BA where B is normal to A.
Flux linkage as Nφ where N is the number of turns cutting the flux.
Flux and flux linkage passing through a rectangular coil rotated in a magnetic field:
flux linkage Nφ = BANcosθ
Simple experimental phenomena.
Faraday’s and Lenz’s laws.
Magnitude of induced emf = rate of change of flux linkage
Ɛ = N ∆ φ/∆ t
Applications such as a straight conductor moving in a magnetic field.
emf induced in a coil rotating uniformly in a magnetic field:
Ɛ = BANω sin ωt
Sinusoidal voltages and currents only; root mean square, peak and peak-to-peak values for sinusoidal waveforms only.
I
rms
= I
0
/√2 ; Vrms = V
0
/√2
Application to the calculation of mains electricity peak and peak-to-peak voltage values.
Use of an oscilloscope as a dc and ac voltmeter, to measure time intervals and frequencies, and to display ac waveforms.
No details of the structure of the instrument are required but familiarity with the operation of the controls is expected.
The transformer equation: N
s
/N
p
= V
s
/V
p
Transformer efficiency =I
S
V
S
/I
P
V
P
Production of eddy currents.
Causes of inefficiencies in a transformer.
Transmission of electrical power at high voltage including calculations of power loss in transmission lines.
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