Scenario
This Assignment has been designed to allow students to show evidence of the application of DC Theorems in realistic
electrical circuits and supporting the learning outcome.
Task 1 : (LO3:3.1) D2
50 V
In the DC circuit shown above, apply Kirchoff’s laws to find the current in each branch.
Task 2 (LO3: 3.2) D2
2.
In the DC circuit shown above, apply Thevenin’s Theorem to find the current
in the 25 Ω resistor.
Task 3 (LO3: 3.3) D1 D2
For the series RC circuit shown above, where there is no initial charge
across the capacitor, on closing the switch, ‘S’, determine:
(a)
the initial value of the current,
(b)
the time constant of the circuit,
(c)
the current’s value after 1 second from switching on,
(d)
the voltage across the capacitor after 1.3 seconds from switch on,
(e)
the time from switch on when the resistor voltage was 32 V.
Task 4 (LO3: 3.3) D1 D2
From the series RL circuit shown above, where there is no initial
voltage across the inductor, on closing the switch, determine:
(a)
the steady-state value of the current flowing in the circuit,
(b)
the time constant of the circuit,
(c)
the induced voltage after 0.08 seconds,
(d)
the time taken for the current to rise to 75% of its final value,
(e)
the value of the current after 0.25 seconds.
Evidence checklist Summary of evidence required by student Evidence presented
Task 1 Circuit diagram showing the application of Kirchoff’s laws for the circuit’s variables.
Task 2 Circuit diagram showing the application of Thevenin’s Theorem for the circuits variables.
Task 3 Circuit diagram of the R-C circuit and tha application of DC theory for the solution of the circuit’s parameters.
Task 4 Circuit diagram of the R-L circuit and tha application of DC theory for the solution of the circuit’s parameters.
Sources of information:
Achievement Summary
Qualification Pearson BTEC Level 4/5 HN Engineering Steams
Assessor name
Dr W Kent PhD CMath CSci AKC PGCE QTS
Unit Number and title 21881C Engineering Science
Student name
Criteria Reference To achieve the criteria the evidence must show that the student is able to: Achieved?
(tick)
LO1
3.1 Solve problems using Kirchoff’s laws to calculate currents and voltages in circuits.
3.2 Solve problems using circuit theorems to calculate currents and voltages in circuits.
3.3
Solve problems involving current growth/decay in an L-R circuit and voltage growth/decay in a C-R circuit.
Higher Grade achievements (where applicable)
Grade descriptor
Achieved?
(tick)
Grade descriptor
Achieved?
(tick)
D1: Use critical reflection to evaluate own work and justify valid conclusions
D2: Take responsibility for managing and organising activities
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