1 2020_21 BTEC Assignment Brief Template Issue Date: June 2020 Owner: BTEC Assessment DCL1 Public (Unclassified) Version 1.0 BTEC Assignment Brief Qualification BTEC Higher Nationals in Engineering...

1
2020_21 BTEC Assignment Brief Template
Issue Date: June 2020
Owner: BTEC Assessment
DCL1 Public (Unclassified)
Version 1.0
BTEC Assignment Brief
Qualification
BTEC Higher Nationals in Engineering
Unit or Component number
and title
Unit 19: Electrical and Electronic Principles
M/615/1493
Level 4
Learning aim(s) (For NQF/RQF
only)
LO2 Analyse circuits with sinusoidal voltages and cu
ents.
Assignment title

LO2 Analyse circuits with sinusoidal voltages and cu
ents.
Assessor
Stephen Hillyard
Hand out date
Wednesday 17th Feb 2021
Hand in deadline
Wednesday 10th March 2021
Vocational Scenario or
Context
You are employed as an Electrical/Electronic specialist at a
Northampton Electrical Engineering consultancy firm.
The company ca
y out design and build of prototype electronic
circuits and as part of your role you are required to ca
y out the
calculations using your AC theory skills in order that the co
ect
component values and frequencies are found.
Task 2
Instructions to students:
Please determine the answers to each of the questions using
your allocated values for each question which as been
assigned to you in the table at the end of the document.
1a) A coil of resistance Aꭥ is in series with inductance of
120mH and also in series with a 100µF capacitor is
connected to a 300V, 50Hz supply. Draw the circuit diagram,
and then calculate (a) the cu
ent flowing, (b) the phase
difference between the supply voltage and cu
ent, (c) the
voltage across the coil and (d) the voltage across the
capacitor, (e) Sketch the phasor diagram showing that V is
the phasor sum of VCOIL and Vc.
2
2020_21 BTEC Assignment Brief Template
Issue Date: June 2020
Owner: BTEC Assessment
DCL1 Public (Unclassified)
Version 1.0
1b) The following three impedances are connected in series
across a supply of B Volts and frequency of C kHz supply:
(i)resistance of 8ꭥ, (ii) a coil of inductance 130µH and 5ꭥ
esistance and (iii) a 10ꭥ resistor in series with a 0.25µF
capacitor. Draw the circuit diagram and then calculate (a)
the circuit cu
ent (b) the circuit phase angle and (c) the
voltage drop across each impedance.


2a) A coil of resistance Dꭥ and inductance of 318.4mH and
esistance is connected in parallel with a 15µF capacitor
across a 200V, 50Hz supply. Calculate (a) the cu
ent in the
coil and its phase angle, (b) the cu
ent in the capacitor and
its phase angle, (c) the supply cu
ent and its phase angle,
(d) the circuit impedance (e) the power consumed, (f) the
apparent power and (g) the reactive power. Draw the phasor
diagram.

2b) A coil with an internal resistance of E kꭥ and an
inductance 0.2 H and resistance is connected in parallel with
a variable capacitor set at 25nF and is supplied at 100 V at a
frequency of 4 kHz. Determine (a) the cu
ent in the coil,
and (b) the cu
ent in the capacitor, (c) Draw to scale the
phasor diagram and measure the supply cu
ent and its
phase angle; check the answer by calculation. Determine (d)
the circuit impedance and (e) the power consumed.

3a) A coil of inductance 100 mH and negligible resistance is
connected in series with a capacitor of 2µF and a resistance
of Fꭥ across a 50V, variable frequency supply. Determine (a)
the resonant frequency, (b) the cu
ent at resonance, (c) the
voltage across the coil and the capacitor at resonance and d)
the Q-factor of the circuit.

3b) A coil with internal resistance of Gꭥ and an inductance of
100mH is connected in parallel with a variable capacitor
across a 12V, 5kHz supply. Determine the condition when
the supply cu
ent is a minimum: (a) the capacitance of the
capacitor ( b) the dynamic resistance, (c) the supply cu
ent
and (d) the Q-factor.
Checklist of evidence
equired
Criteria covered by this task:
Unit/Criteria reference To achieve the criteria you must show that you are able to:
LO2 Analyse circuits with sinusoidal voltages and cu
ents.
P2 Analyse series RLC
circuits, using the
principles of circuit
theory with sinusoidal
sources.
M2 Analyse series and
parallel RLC circuits,
using the principles of
circuit theory with
sinusoidal sources.
D2 Analyse the operation and
ehaviour of series and
parallel RLC circuits, including
esonance and using the
principles of circuit theory
with sinusoidal sources.
3
2020_21 BTEC Assignment Brief Template
Issue Date: June 2020
Owner: BTEC Assessment
DCL1 Public (Unclassified)
Version 1.0
L02 data
A ꭥ B ꭥ C kHz D ꭥ E kHz F G
Liam XXXXXXXXXX XXXXXXXXXX
Lee XXXXXXXXXX XXXXXXXXXX
Livui XXXXXXXXXX XXXXXXXXXX
George XXXXXXXXXX XXXXXXXXXX
Bradley XXXXXXXXXX XXXXXXXXXX
Brett XXXXXXXXXX XXXXXXXXXX
James XXXXXXXXXX XXXXXXXXXX
Luca XXXXXXXXXX XXXXXXXXXX
Ben XXXXXXXXXX XXXXXXXXXX
Daniel XXXXXXXXXX XXXXXXXXXX
Danyal XXXXXXXXXX XXXXXXXXXX
Thomas XXXXXXXXXX XXXXXXXXXX
Jordan XXXXXXXXXX XXXXXXXXXX
Charlotte XXXXXXXXXX XXXXXXXXXX
Matthew XXXXXXXXXX XXXXXXXXXX
Jack XXXXXXXXXX XXXXXXXXXX
Jared XXXXXXXXXX XXXXXXXXXX
Max XXXXXXXXXX XXXXXXXXXX
John XXXXXXXXXX XXXXXXXXXX
Sources of information to
support you with this
Assignment
Please refer to notes and lesson recordings to support your
completion of this assignment.
Other assessment
materials attached to this
Assignment Brief
None