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Term 1
Unit 1 Dynamic Electricity and Electromagnetism: Chapter 1 Electric Current and Ohm’s Law (with Kirchhoff’s laws), Chapter 2 Magnetic Effects of Electric Current and Measuring Instruments, Chapter 3 Electromagnetic Induction, Chapter 4 Alternating Current Circuits; Term 1 review
1
Current, resistance, series and parallel
Chapter 1 Electric Current and Ohm’s Law (A): what the book revises (current, potential difference, emf, resistance and resistivity, conductivity, Ohm’s law, conventional current), then resistors in series and in parallel and their equivalent resistance
2
The emf, internal resistance and the closed circuit
Chapter 1 (B): the emf of a cell and its internal resistance, Ohm’s law for a closed circuit I = V
B
/(R + r), terminal voltage V = V
B
− Ir and the emf as the open-circuit voltage, worked circuits (series, parallel, series-parallel, internal resistance)
3
Kirchhoff’s two laws
Chapter 1 (C): Kirchhoff’s first law (conservation of charge, the node rule) and second law (conservation of energy, the loop rule), the guidelines for assumed current directions and signs, and three worked multi-loop circuits
4
The magnetic field of a wire and of a loop
Chapter 2 Magnetic Effects of Electric Current and Measuring Instruments (A): Oersted’s observation, the field of a straight wire (flux density B = μI/2πd, Ampere’s right-hand rule) and of a circular loop (B = μNI/2r, the right-hand screw rule, the loop as a magnetic dipole)
5
The solenoid, the force on a wire and parallel wires
Chapter 2 (B): the solenoid (B = μnI = μNI/ℓ, poles by the screw rule), the force on a current-carrying wire in a magnetic field (F = BIℓ sin θ, Fleming’s left-hand rule, the tesla) and the force between two parallel wires
6
Torque on a coil and the moving-coil galvanometer
Chapter 2 (C): worked force problems, the torque on a rectangular coil (τ = BIAN sin θ, the magnetic dipole moment) and the moving-coil galvanometer (construction, radial field, sensitivity)
7
From galvanometer to ammeter, voltmeter and ohmmeter
Chapter 2 (D): the galvanometer as an ammeter (shunt) and a voltmeter (multiplier), the ohmmeter and its non-linear scale, analogue and digital multimeters; the chapter summary and exercises (pp. 52–58) are not used
8
Faraday, Lenz and mutual induction
Chapter 3 Electromagnetic Induction (A): Faraday’s experiment and the induced emf, Faraday’s law emf = −N ΔΦ/Δt, Lenz’s rule, Fleming’s right-hand rule, mutual induction (M, the henry as V·s/A) and the two-coil experiments
9
Self-induction, eddy currents and the AC generator
Chapter 3 (B): self-induction (emf = −L ΔI/Δt, the henry), what the self-inductance depends on, eddy currents and induction furnaces, the emf in a straight wire moving across a field (emf = Bℓv sin θ), and the construction and emf of the AC generator
10
The sine wave, the DC generator and the transformer
Chapter 3 (C): the sine wave of a generator and its frequency (50 Hz at home), the effective value (0.707 of the maximum), rectification and the DC generator (split-ring commutator), the transformer (turns, voltage and current ratios, step-up and step-down)
11
Power transmission, transformer efficiency and the DC motor
Chapter 3 (D): transformers in power transmission (I²R loss) and their efficiency, the two transformer examples, the DC motor (construction, Fleming’s left-hand rule, the commutator, one revolution, several coils, motor against galvanometer); the summary and exercises (pp. 86–96) are not used
12
Alternating current, resistors and coils
Chapter 4 Alternating Current Circuits (A): the sine waveform, frequency (50 Hz in Egypt) and the advantages of AC, why a moving-coil ammeter fails and the hot-wire ammeter, voltage and current in a resistor (in phase) and in a coil (voltage leads by 90°), inductive reactance XL = 2πfL, coils in series and parallel
13
The capacitor, reactance and impedance
Chapter 4 (B): the capacitor (Q = CV) on DC and on AC (the current leads, the voltage lags by 90°), capacitive reactance XC = 1/2πfC, capacitors in series and in parallel, impedance and the series RL circuit (Z = √(R² + XL²), phase angle, voltages add as vectors)
14
RC and LCR circuits, oscillations and resonance
Chapter 4 (C): the series RC and LCR circuits (Z = √(R² + (XL − XC)²), the phase angle and the three cases, power only in the resistor), the oscillating LC circuit and f = 1/2π√(LC), resonance and the tuned circuit of a radio; the summary and exercises (pp. 114–116) are not used
15
Term 1 review: circuits, magnetism, induction and AC
Term 1 review (Chapters 1–4) and Darslab’s own review tasks
☰ Year plan · Physics
Egypt
›
Secondary 3
›
Physics
›
Week 6
Torque on a coil and the moving-coil galvanometer
Week 6 · Chapter 2 (C): worked force problems, the torque on a rectangular coil (τ = BIAN sin θ, the magnetic dipole moment) and the moving-coil galvanometer (construction, radial field, sensitivity) · 3 lessons
Lesson 1
Lesson 2
Lesson 3
Quiz
8
Homework
5
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