Download Learning Area

Educator and Tagging Information
Learning Area:
Technology
Resource Name:
Technology
Assessment Exemplar Number:
TECHN9.111
Item/s:
1
Phase:
Senior Phase
Grade:
9
Tags:
Technology, systems and control, electrical systems, electronic circuits, devices, output, input,
systems diagram, circuit, relay circuit, sensor, resistance, light sensor, sensing circuit, component,
function, variable resistor, LDR, light-dependent resistor, preset resistor, diode, parallel, relay,
worksheet, Formative Assessment
Assessment Type:
Formative
Assessment Form/s:
Worksheet
Copyright for included material:
N/A
Duration:
60 min
Learning Outcome(s) and Assessment Standard(s):
Learning Outcome 2: Technological Knowledge and Understanding
The learner will be able to understand and apply relevant technological knowledge ethically and
responsibly.
Assessment Standards
We know this when the learner
3 Systems and Control
3.2 Demonstrates knowledge and understanding of how simple electronic circuits and devices are
used to make an output respond to an input signal (e.g. resistors, light-emitting diodes, transistors,
push or magnetic switches, thermistors, light-dependent resistors).
Learning Space:
Assessment
Hyperlinks:
To be completed later.
Rating:
Number of questions for exemplar:
1
Easy questions:
Medium questions:
Question 1
Difficult questions:
Assessment Task
Identifying systems
1.1
The systems diagram below shows how this circuit works when the daylight fades and a relay
circuit turns on the street lights.
1.1.1
1.1.2
1.1.3
1.1.4
1.1.5
1.2
What is component A called?
[2 marks]
What is component B called?
[2 marks]
Which component is the one that behaves as a sensor?
[2 marks]
How does the resistance of this component change?
[2 marks]
Which component is used to adjust the sensitivity?
[2 marks]
The dark-sensing circuit shown above can be altered to detect light. Complete the next circuit
by adding the light sensor.
[6 marks]
1.3
1.4
What is the name of component C shown in the sensing circuit above?
What is its function ?
[2 marks]
[2 marks]
[20 marks]
Suggested Solutions
Question
number
1
Possible
marks
2 marks
2 marks
2 marks
2 marks
2 marks
6 marks
2 marks
2 marks
Answers
1.1.1 Preset or variable resistor
1.1.2 Light-dependent resistor (LDR)
1.1.3 LDR
1.1.4 As the light fades, its resistance increases.
1.1.5 The preset resistor.
1.2
1.3 Diode
1.4 The diode will be placed in parallel to the relay and the opposite way
around. When the circuit is turned off, the diode will protect the other
components.
[20 marks]
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