Electronics

Act 1

Objectives

• Understand basic conductors and insulators.

• Understand the Electronic Systems.

• Voltage, Current and Resistance and Ohms Law

Electricity and Electronics are used to provide

1. Comfort

2. Keeping time

3. Work and play

4. Communication

5. Transport

6. Education and Entertainment.

Block Diagram of Electronic System

• Input: Gather information

• Process : Deciding what to do with the information

• Output : Generate an action either visual indicator, sound, movement

• Feedback: A return path to gather information back to the processor to make decision so that adjustment can be made to the output.

Conductors and Insulators

• What are conductors and insulators? : Click here

• An Electrical Conductor is a material that allows electricity to flow through.

• An Electrical Insulator is a material that electricity cannot flow through easily.

Voltage , Current and Resistance

• Electricity serves two purpose in Electronics System. To provide power or to carry information.

• All Electronics circuits need electricity to power them.

• Examples of sources of Electricity comes from Battery , Solar Call or AC mains.

• What is Current? Click here

• What is voltage? Click here

• What is Resistance? : Click here

The relationship between Voltage, Current and Resistance is defined by Ohms Law where voltage is directly proportional to the currently flow in a circuit with a given resistance.

Ohms law state that V = I X R

Questions

1. State three applications of Electronics and Electrical systems

2. Draw and explain the Electronics Block Diagram

3. State the definition of conductors and insulators. Given one examples each.

4. State Ohms Law and explain what is the relationship between Voltage, current and resistance in a circuit.

5. Click on this link to run this simulation.

   1. Click on the slide bar to varies the value of V and R. What is the relationship between V, I and R?

   2. What is the unit of measurement of current , voltage and Resistance?

   3. What happen to the number of cells when V is increase or decreased. How are the cells connected?