| | |
| > | Understand the physical properties of electromagnetic induction. This will include: |
|
| |
|
| C | 1.1 | Relates the laws of electromagnetic induction to motor generator and transformer principles. |
|
| |
|
| C | 1.2 | Explains the meter principle in terms of the interaction between a magnetic field and a current carrying conductor. |
|
| |
|
| | 1.3 | Explains the basis of the formula F=Bli Newton’s (Force = Flux density times length of the conductor in the magnetic field). |
|
| |
|
| | 1.4 | Explains the linear relationship existing between E and the other terms on the basis of the formula E=Blv. (emf generated = magnetic flux times length of the conductor in the field times velocity of the conductor) |
|
| |
|
| | 1.5 | Describes the production of an induced e.m.f due to a changing magnetic field. |
|
| |
|
| R | 1.6 | States Lenz's Law. |
|
| |
|
| | 1.7 | States Faraday's Law of electro magnetic induction. |
|
| |
|
| C | 1.8 | Explains the generator principle in terms of Faradays laws and Lenz's law. |
|
| |
|
| R | 1.9 | Defines self inductance and states its effects. |
|
| |
|
| | 1.10 | States the effect of self and mutual inductance. |
|
| |
|
| C | 1.11 | Describes the transformer principle in terms of Lenz's law and the induced volts per turn. |
|
| |
|
| | 1.12 | Deduces for a transformer the effect of turns ratio on the voltage ratio. |
|
| |
|
| A | 1.13 | Relates the equation E = L di/dt to the equation E = N d>/dt. |
|
| |
|
| R | 1.14 | States the unit of inductance. |
|
| |
|
| | 1.15 | States the formula representing the energy stored by an inductor. |
|
| |
|
| A | 1.16 | Calculate the energy stored in an inductor. |
|
| |
|
| A | 1.17 | Demonstrate the ability to test the physical properties of electromagnetic induction.
|
| | |
| > | Understands the principles of operation of transformers. This will include: |
|
| |
|
| R | 2.1 | States the essential features of construction of power a.f and r.f transformers. |
|
| |
|
| | 2.2 | Draws the phasor diagram for an ideal transformer on no-load. |
|
| |
|
| | 2.3 | States the physical and electrical conditions that exist for an ideal transformer. |
|
| |
|
| | 2.4 | States the equation N2/N1 = V 2/V1 = I1/I2. |
|
| |
|
| | 2.5 | States that a transformer can be used to match a source to load.(Maximum Power Transfer Theorem). |
|
| |
|
| | 2.6 | Outlines the derivation of the relationship :- R2 = R1 (N2/N1)2 for transformer matching. |
|
| |
|
| | 2.7 | States the sources of iron losses in the core and differentiates between them. |
|
| |
|
| C | 2.8 | Explains the choice of transformer core materials and construction to minimise core losses. |
|
| |
|
| A | 2.9 | Demonstrate an ability to test the operation of transformers. |
|
|
|
| | |
| > | Understand the concepts of alternating quantities. This will include: |
|
| |
|
| R | 4.1 | Describing the concepts of alternating quantities. |
|
| |
|
| | 4.2 | Identifies alternating and unidirectional (sinusoidal and non-sinusoidal) waveforms from given sketches. |
|
| |
|
| | 4.3 | Defines the terms amplitude, period and frequency, and the values: instantaneous, peak-to peak, r.m.s. and average. |
|
| |
|
| | 4.4 | Defines form factor. |
|
| |
|
| A | 4.5 | Determines the approximate average and r.m.s. values of given sinusoidal and non-sinusoidal waveforms. |
|
| |
|
| R | 4.6 | States the average value, the r.m.s. value and the form factor of a sine wave. |
|
| |
|
| A | 4.7 | Relates and calculates the quantities defined in 4.6 from given data. |
|
| |
|
| | 4.8 | Uses phasor and algebraic representation of sinusoidal quantities. |
|
| |
|
| R | 4.9 | Defines a phasor quantity. |
|
| |
|
| A | 4.10 | Determines the resultant of the addition of two sinusoidal voltages by graphical and phasor representation. |
|
| |
|
| | 4.11 | Explains the phase-angle relationship between two alternating quantities. |
|
| |
|
| | 4.12 | Defines a sinusoidal voltage in the form ( ). |
|
| |
|
| A | 4.13 | Determines current from the application of a Sinusoidal voltage to a resistive circuit. |
|
| |
|
| A | 4.14 | Interrelates graphical, phasor and algebraic representation in the determination of amplitude, instantaneous value, frequency period and phase of sinusoidal voltage and currents. |
|
| |
|
| | 4.15 | Determines power in an a.c. resistive circuit from given data. |
|
| |
|
| | 4.16 | Relates the concepts of a.c. theory to an elementary treatment of half-and-full wave rectification. |
|
| |
|
| R | 4.17 | Defines the elementary principles of half-and-full wave rectification. |
|
|
|
| | |
| > | Understands the principles of AC circuits. This will include: |
|
| |
|
| R | 5.1 | States the relationship between V and I in the following circuits: |
|
| |
|
| | | -purely resistive |
|
| | | -purely inductive |
|
| | | -purely capacitive |
|
| |
|
| | 5.2 | Draws the phasor diagrams and relative voltage and current waveforms relating to 5.1. |
|
| |
|
| | 5.3 | Describes inductive reactance and capacitive reactance in terms of impeding the flow of an alternating current. |
|
| |
|
| | 5.4 | States inductive reactance as : XL = VL/IL = . |
|
| |
|
| | 5.5 | States capacitive reactance as: Xc = Vc/Ic = 1/2 fC = l / C. |
|
| |
|
| A | 5.6 | Applies the equation in 5.4 and 5.5 to simple problems. |
|
| |
|
| R | 5.7 | Draws phasor diagrams corresponding to L-R and C-R series circuits. |
|
| |
|
| A | 5.8 | Determines voltage triangles derived from the phasor diagrams of 5.7. |
|
| |
|
| C | 5.9 | Defines impedance (Z = V/I). |
|
| |
|
| A | 5.10 | Derives impedance triangles from voltage triangles. |
|
| |
|
| C | 5.11 | Shows that Z = R2 + x2 and that Tan = X/R, Sin = X/Z and Cos = R/Z. |
|
| |
|
| A | 5.12 | Calculates for single branch L-R series circuits at power and radio frequencies. |
|
| |
|
| R | 5.13 | States the formula for power dissipation. |
|
| |
|
| C | 5.14 | Shows graphically the average power for sinusoidal currents and voltages for a: |
|
| |
|
| | | -purely resistive a.c. circuit |
|
| | | -resistive/reactive a.c. circuit |
|
| |
|
| R | 5.15 | States the power formula for sinusoidal waveforms. |
|
| |
|
| A | 5.16 | Derives the power triangle from the voltage triangle. |
|
| |
|
| R | 5.17 | Identifies true power (P) apparent power (S) and reactive volt amperes (Q). |
|
| |
|
| C | 5.18 | Defines power factor (true power/apparent power) and shows that where V and I are sinusoidal, power factor = Cos. . |
|
| |
|
| A | 5.19 | Applies equation in 5.17 and 5.18 to the solution of single branch L-R series circuits at power and radio frequencies. |
|
| |
|
| C | 5.20 | Explains power dissipation in series L-R and C-R a.c. circuits (I2 R). |
|
| |
|
| A | 5.21 | Uses phasor diagrams to solve simple series L,C and R a.c. circuits. |
|
| |
|
| C | 5.22 | Defines series resonance in terms of the phase relationship between the supply voltage and supply current. |
|
| |
|
| R | 5.23 | Sketches a phasor diagram showing that VL = V at series resonance. |
|
| |
|
| C | 5.24 | Shows that VL and Vc may be many times supply V. |
|
| |
|
| R | 5.25 | States the conditions for series resonance. |
|
| |
|
| C | 5.26 | Derives and applies the formula for the series resonance frequency. |
|
| |
|
| | 5.27 | Defines Q-factor as the voltage magnification in series circuit. |
|
| |
|
| | 5.28 | Explains: |
|
| |
|
| | | -advantages of high Q-factor in series power circuits |
|
| | | -disadvantages of high Q-factor in series power circuits |
|
| |
|
| A | 5.29 | Applies the formula for the parallel resonance frequency. |
|
| |
|
| | 5.30 | Explains how the power-factor may be improved using static capacitors. |
|
| |
|
| R | 5.31 | Defines the bandwidth. |
|
| |
|
| C | 5.32 | Explains the effect of variation of component values upon bandwidth. |
|
| |
|
| R | 5.33 | Draws response curves of simple couple tuned circuits. |
|
| |
|
| C | 5.34 | Describes the effect of variation of coupling upon response. |
|
| |
|
| | 5.35 | Explains the use of resonant circuits to select and amplify signals. |
|
|
|
