Power Generation/distribution

Syllabus Dot Point

power generation/distribution

– electrical energy and power

– simple circuits

Thermal Power (coal or gas)

Hydro Electricity

Wind Power

Nuclear Power

What are the effects of power generation on the environment?

Task: Compile a list of good and bad points for each power source.

Electricity Distribution

Task: Watch the two videos and write some summary notes on power distribution.

ALARM matrix renewable energy.docx

Watch the video and complete the matrix

AC/DC Circuits

The voltage and frequency of alternating current (AC) electricity used in homes is 240-volt. 50Hz (50 Hertz or 50 cycles per second) as the frequency.

Task:

What is the difference between AC and DC?

Give some examples of DC systems used in everyday life.

Rectification

Power supplied to your home usually uses an alternating current (AC) since it’s more efficient and doesn’t lose voltage over long distances. However, many appliances and electronics use direct current (DC), which provides consistent power to the device. The conversion from AC to DC is called rectification.

What components are in rectifier circuits?
What is the purpose of a diode in a circuit?
Draw a circuit diagram for a half wave rectifier. Sketch the sine wave pattern.
Draw a circuit diagram for a full wave rectifier.Sketch the sine wave pattern.
Why is a capacitor used in the circuit?
Draw the sine wave pattern with a capacitor added.
What is the effect of adding another or larger capacitor?

8. What does a bleeder resistor do?

9. What type of electricity do solar panels produce?

10.How can we convert DC to AC?

Rectifiers

Why are half wave rectifiers not efficient?

Draw a diagram to represent AC power, DC power, full and half wave rectification

Review Questions

1. What is the concept that links electrical generators and electric motors regarding electric current and magnetic fields?
2. Name various methods of generating electricity.
3. Discuss the advantages of the various methods?
4. Describe the method of distributing electricity from the power station to the consumer.
5. Why is high voltage used to distribute electricity?
6. If transmission of electricity is efficient at high voltage, why are various voltages used for transmission in the grid?
7. What is the function of a sub-station in the power grid?
8. Why are AC and DC currents selected for applications?
9. Describe how an AC current can be converted to a DC current?
10. How is electricity measured? What are the units of measurement?

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