8) This describes the essential skills and knowledge and their level, required for this unit. Evidence shall show that knowledge has been acquired of safe working practices and solve electrotechnical engineering problems. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-EE129A Electrotechnical engineering principles Evidence shall show an understanding of electrotechnical principles to an extent indicated by the following aspects: T1 Resistance encompassing: relationship between voltage, current and resistance and the power dissipated in a circuit value of voltage, current and resistance in a circuit given any two of these quantities the factors of length, cross-sectional area and material effect the resistance of conductors effects of temperature change on the resistance of various conducting materials features of fixed and variable resistor types and typical applications characteristics of temperature, voltage and light dependent resistors and typical applications of each T2 Series circuits encompassing: measurement of resistance, voltage and current values in a single source series circuit the voltage, current, resistances or power dissipated from measured or given values of any two of these quantities relationship between the voltage drops around a circuit and the applied voltage T3 Parallel circuits encompassing: measurement of resistance, voltage and current values in a single-source parallel circuit the voltage, current, resistance or power dissipated from measured or given values of any of these quantities relationship between currents entering a junction and currents leaving a junction T4 Series/parallel circuits encompassing: measurement of resistance, voltage and current values in a single-source series / parallel circuit the voltage, current, resistances or power dissipated from measured or given values of any two of these quantities T5 Measurement of electrical quantities encompassing: operating characteristics of analogue and digital meters selecting an appropriate meter in terms of units to be measured, range, loading effect and accuracy for a given application T6 Capacitance/Capacitors encompassing: definition of capacitance and explain how a capacitor is charged the units by which capacitance is measured relationship between capacitance, voltage and charge behaviour of a series d.c. circuit containing resistance and capacitance components factors which determine the capacitance of a capacitor and explain how these factors are present in all circuits to some extent T7 Magnetism and electromagnetism encompassing: field patterns around given permanent magnets magnetic field patterns around a straight current carrying conductor and a solenoid direction in which the magnetic field around a straight current carrying conductor T8 Electromagnetic induction encompassing: factors required to induce an emf in a conductor T9 Sinusoidal alternating voltage and current encompassing: how a sinusoidal voltage is generated in a single turn coil rotated in a uniform magnetic field definition of the terms ‘period’, ‘maximum value’, ‘peak-to-peak value’, ‘instantaneous value’, ‘average value’ and ‘root-mean-square (r.m.s.) value’ in relation to a sinusoidal waveform instantaneous value of induced voltage of a generated sinusoidal waveform root-mean-square (r.m.s.) value and frequency of a sinusoidal waveform from values of peak voltage and period T10 Test equipment encompassing: operating principles of a CRO including block diagram of functional areas set up, calibration and use of an oscilloscope to measure d.c and a.c. voltages and frequency measurement of the instantaneous, peak, peak-to-peak values and the period of sinusoidal and other common waveforms provided by a signal generator calibration and limitation of CRO probes use of signal generator as a voltage source T11 Phase relationships in a.c. circuits encompassing: phasor representation of graphical waveforms ‘in-phase’, ‘out-of-phase’, ‘phase angle’, ‘lead’, and ‘lag’ convention for representing voltage, current and the reference quantity in a phasor diagram phasor diagrams to show the relationship between two or more a.c. values of voltage and/or current T12 Single-source resistive a.c. circuits of various frequencies encompassing: single-source a.c. circuit and taking resistance, voltage and current measurements voltage, current, resistances or power dissipated from measured or given values of any two of these quantities T13 Inductance in a.c. circuits encompassing: concept of inductance, self-inductance and mutual inductance. (in terms of storage of magnetic energy) factors affecting inductance and how the unit of inductance is derived value of induced voltage in a given circuit how a series d.c. circuit containing resistance and inductance behaves ‘inductive reactance’ inductive reactance of a given inductor and show the relationship between inductive reactance and frequency applying Ohm’s law to determine voltage, current or inductive reactance in a purely inductive a.c. circuit given any two of these quantities examples of inductive components in circuits and systems and describe their effect on the phase relationship between voltage and current T14 Capacitance in a.c. circuits encompassing: capacitive reactance of a given capacitor and the relationship between capacitive reactance and frequency applying Ohm’s law to determine voltage, current or capacitive reactance in a purely capacitive a.c. circuit given any two of these quantities examples of capacitive components in electronic circuits and systems and describe their effect on the phase relationship between voltage and current T15 Impedance in a.c. circuits encompassing: definition of ‘impedance’ impedance of series, parallel and series-parallel circuits and draw diagrams showing the relationship between resistive, inductive and capacitive components single-source a.c. circuit with resistance, voltage and current measurements determination of the voltage, current or impedance from measured or given values of any two of these quantities using phasor diagrams to solve problems and show the relationship between voltages and currents in a.c. circuits |