19 Electricity Analogue and Teacher presentation: types of signal analogue and digital and Review of The task involves – – and digital signals (4b) their applications; characteristic features of sinusoidal wave forms. produced plotting data on graphs, and the electronics Characteristics of Possible support materials for this topic could include graphs and (AO4) sinusoidal wave circuit stretch activity may forms (4e) designs; involve calculating and , the values of review of components in Demonstration of the use of an data circuits captured oscilloscope to show waveforms. Speaking and Practical activity learners could work in pairs, plotting how the from – listening skills used oscilloscope resistance of an LDR (or thermistor or moisture detector) changes in the paired testing activity; work homework with respect to the amount of light (or temperature or moisture). For The use of worksheets a presented application (such as an automatic window opener in a components and the greenhouse), if the device in question was an input they should design and identify a suitable value at which to trigger the system. They could manufacture of the then proceed to design a simple circuit to out this activity and circuits in the stretch model it either virtually, using appropriate CAD software, or activity also physically, using a breadboard. support or benefit from Teacher presentation: characteristic features of sinusoidal wave performance outcomes Demonstration of the use of an oscilloscope to show 3 in the Control systems unit. waveforms. The use of graphs Practical activity: learners could use oscilloscopes to quantify the could also support important characteristics of a number of pre-prepared output devices assessment outcome 6 in the Maths for (ac power supplies). engineers unit Homework activity: worksheet, where the students have to identify The suggested the frequency, amplitude and periodic time of examples of sinusoidal engineering context is linked to agriculture – wave however, it could be modified to represent the input devices used in mechatronic
19 Electricity and electronics (AO4) Analogue and digital signals (4b) Characteristics of sinusoidal wave forms (4e) Teacher presentation: types of signal – analogue and digital – and their applications; characteristic features of sinusoidal wave forms. Possible support materials for this topic could include and , Demonstration of the use of an oscilloscope to show waveforms. Practical activity – learners could work in pairs, plotting how the resistance of an LDR (or thermistor or moisture detector) changes with respect to the amount of light (or temperature or moisture). For a presented application (such as an automatic window opener in a greenhouse), if the device in question was an input they should identify a suitable value at which to trigger the system. They could then proceed to design a simple circuit to out this activity and model it either virtually, using appropriate CAD software, or physically, using a breadboard. Teacher presentation: characteristic features of sinusoidal wave Demonstration of the use of an oscilloscope to show waveforms. Practical activity: learners could use oscilloscopes to quantify the important characteristics of a number of pre-prepared output devices (ac power supplies). Homework activity: worksheet, where the students have to identify the frequency, amplitude and periodic time of examples of sinusoidal wave Review of produced graphs and circuit designs; review of data captured from oscilloscope activity; homework worksheets The task involves plotting data on graphs, and the stretch activity may involve calculating the values of components in circuits Speaking and listening skills used in the paired testing work The use of components and the design and manufacture of the circuits in the stretch activity also support or benefit from performance outcomes 3 in the Control systems unit. The use of graphs could also support assessment outcome 6 in the Maths for engineers unit The suggested engineering context is linked to agriculture – however, it could be modified to represent the input devices used in mechatronic