Boroughmuir High School


To assess your understanding of this unit use the scale, '1' = 'I can do very well' to '4' = 'I cannot do at all'. Credit level emphasised.


  1. State that an electronic system consists of 3 parts; input process and output.
  2. Distinguish between digital and analogue outputs.
  3. Identify analogue and digital signals from waveforms viewed on an oscilloscope.

Output Devices

  1. Give examples of output devices and the energy conversion involved.
  2. Give examples of digital and analogue output devices.
  3. Draw and identify the symbol for an LED.
  4. State that an LED will only light if connected one way around.
  5. Explain the need for a series resistor with an LED.
  6. State that different numbers can be produced by lighting appropriate segments of a 7-segment display.
  7. Identify appropriate output devices for a given application.
  8. Describe a circuit diagram which will allow an LED to light.
  9. Calculate the value of a series resistor for an LED.
  10. Calculate the decimal equivalent of a binary number in range 0000 - 1001.

Input Devices

  1. Describe the energy transformations involved in the following devices: microphone, thermocouple and solar cell.
  2. State that the resistance of a thermistor changes with temperature and the resistance of an LDR decreases with increasing light intensity.
  3. Carry out calculations using voltage, current and resistance for the thermistor and the LDR.
  4. State that during charging the voltage across a capacitor increases with time.
  5. Identify from a list an appropriate input device for a given application.
  6. Carry out calculations involving voltages and resistances in a voltage divider.
  7. State that the time to charge a capacitor depends on the values if the capacitance and the series resistance.
  8. Identify appropriate input devices for a given application.

Digital Processes

  1. State that a transistor can be used as a switch.
  2. State that a transistor may be conducting or non-conducting (on or off).
  3. Draw and identify the circuit symbol for an NPN transistor.
  4. Identify from a circuit diagram the purpose of a transistor switching circuit.
  5. Draw and identify the symbols for two input AND and OR gates and a NOT gate.
  6. State that logic gates may have one or more inputs and that a truth table shows the outputs for all possible input conditions.
  7. State that: high voltage = logic '1' and low voltage = logic '0'.
  8. Draw the truth tables for two input AND and OR gates and a NOT gate.
  9. Explain how to use combinations of digital logic gates for control in simple situations.
  10. State that a digital circuit can produce a series of clock pulses.
  11. Give an example of a device containing a counter circuit.
  12. State that there are circuits which can count digital pulses.
  13. State that the output of the counter circuit is in binary.
  14. State that the output of the binary counter can be converted into decimal.
  15. Explain the operation of a simple transistor switching circuit.
  16. Identify the following gates from truth tables: two-input AND two-input OR NOT (inverter)
  17. Complete a truth table for a simple combinational logic circuit.
  18. Explain how a simple oscillator built from a resistor, capacitor and inverter operates.
  19. Describe how to change the frequency of the clock.

Analogue Processes

  1. Identify from a list, devices in which amplifiers play an important part.
  2. State the function of the amplifier in devices such as radios, intercoms and music centres.
  3. State that the output signal of an audio amplifier has the same frequency as, but has a larger amplitude than, the input signal.
  4. Carry out calculations involving input voltage and voltage gain of an amplifier.
  5. Describe how to measure the voltage gain of an amplifier.
  6. Carry out calculations involving power, current and resistance (impedance).
  7. Carry out calculations involving input power, output power and power gain of an amplifier.