On completion of this unit, and as a result of instruction and practical activities, the candidate should be able to:
- Explain the terms...Terms: tolerance, power rating, stability, colour and numerical coding and preferred value ranges
- Describe the system of numerical and both four and five band colour coding used to identify the ohmic value and tolerance of resistors
- List the preferred values of resistance forming the 10% range
- Identify series and parallel connections of resistors and in each case derive the equivalent resistance formula
- Explain Ohm's law and solve simple problems involving resistors in series and/or parallel connected in a dc circuit
- Explain the function and describe the construction of typical variable resistors used for panel mounting and circuit board assemblies, Variable resistors.- continuously variable, preset types
- Explain the function and describe the construction of non-linear resistive devices. Non-linear resistive devices: thermistor (temperature dependent resistors), light dependent resistors (LDR)
- Draw the internationally accepted circuit symbols for fixed resistors, preset and variable resistors, thermistors and light dependent resistors
|
