Volt-ampere characteristic of a semiconductor

Long-term plan unit:

School:

Date:

Teacher name:

Grade: 10

Number present:

absent:

Theme of the lesson

Laboratory work "Volt-ampere characteristic of a semiconductor diode and incandescent lamp"

Learning objectives that are achieved at this lesson(Subject Programme reference)

- electrical characteristics, the symbols of these characteristics in the schemes, electrical circuits;

- Explanation and graphic representation of the current-voltage characteristic of a metallic conductor, semiconductor and a heating lamp

Lesson outcomes

Repetition of Ohm's law; electrical characteristics, symbols in electrical circuits and electrical circuits;

-          Understands and graphs depicts the current-voltage characteristics of a metal conductor, semiconductor, and a heating lamp.

Success criteria

Application:

May collect simple schemes;

Higher Level Skills:

Compares current-voltage characteristics and explains the differences.

Analyzes the results obtained and is able to draw current-voltage characteristics;

Language objectives

Subject vocabulary and terminology:

Phrases necessary for dialogue:

For metallic conductors at constant temperature

The heating lamp and semiconductor diode show no dependence not consistent with Ohm's law.

A semiconductor diode has a low resistance in one direction and in other directions it has a continuously large resistance.

Values instilled at the lesson

Students’ achieve of specific learning objectives, and get a certain amount of knowledge, but also develop the ability to apply their knowledge in solving learning and life problems,

Cross-curricular links

Other subject links include Mathematics, IT

ICT skills

ICT links to use of computers, data loggers, scientific calculators and tablets etc. Making use of internet resources and encourage students to research information online as well as using ICT tools like professional presenter, use of smart board to aid learning.

Previous learning

Material class 8 for the section "Electrostatics"

Course of the lesson

Planned stages of the lesson

Planned activities at the lesson

Resources

Beginning of the lesson

Greetings students

Student check

Explanation of the purpose of the lesson

In this section, students answer questions that know, questions that do not know the answers are glued with a sticker.

Or, for questions that knows the answers well, it glues green, and for questions that are not sure, it glues yellow and for questions that does not know the answer, a red sticker glues.

1. What is electric current?

2. In order for the electric current to flow continuously through the conductor, what condition should be fulfilled?

3. What are the sources of DC?

4. Formulate Ohm's law?

5. Do you know the current-voltage characteristic of the resistor? Consistent with Ohm's law?

6. Do you know the current-voltage characteristic of a semiconductor diode? Consistent with Ohm's law?

7. Do you know the current-voltage characteristic of an incandescent lamp? Consistent with Ohm's law?

8. What is a diode? What is it used for?

9. What is a semiconductor?

10. Is it a conductor?

11. Is the dielectric it?

10 mins

10 mins

10 mins

35 mins

Experiment number 1

Getting the current-voltage characteristics of the lamp heating

The purpose of the experiment: Obtaining the current-voltage characteristics of the heating lamp and the study for compliance with the law of ohm.

Instruments and accessories: two multimeters (the first one is set to measure the current 200 mA, and the second one is put to the voltmeter 20 V), the power source is 12 V, the heating lamp, the key.

The course of the experiment:

1. Assemble the circuit shown in the figure.

2. After assembling the scheme, you are obliged to show the scheme to the teacher or laboratory assistant.

3. Open the excel program on your computer and select the cells to enter the measurement results.

4. Select the value of voltage in the range from 0 to 12 V with this should be at least 6 values ​​in the order of increasing. By varying the voltage of the current source according to the selected values, determine the appropriate amperage. Enter all values ​​into the excel program.

5. According to the data obtained in the experiment, construct a graph of dependence I (U).

6. Draw conclusions and discuss in groups. Compare your findings with the results of other groups.

Experiment number 2

Getting volt-ampere characteristics of a semiconductor diode

The purpose of the experiment: Obtaining the current-voltage characteristics of a semiconductor diode and research on compliance with the law of ohm.

Instruments and accessories: two multimeters (the first one is set to measure current of 200 mA, and the second one is put up to a voltmeter of 20 V), a power source of 12 V, a diode, a key.

The course of the experiment:

1. Assemble the circuit shown in the figure.

2. After assembling the scheme, you are obliged to show the scheme to the teacher or laboratory assistant.

3. Open the excel program on your computer and select the cells to enter the measurement results.

4. Select the voltage value in the range from 0 to 0.8 V; this should be at least 6 values ​​in increasing order. By varying the voltage of the current source according to the selected values, determine the appropriate amperage. Enter all values ​​into the excel program.

5. According to the data obtained in the experiment, construct a graph of dependence I (U).

6. Draw conclusions and discuss in groups. Compare your findings with the results of other groups.

two multimeters, 12 V power supply, heating lamp, key

End

5 mins

Tr. and learners summaries the lesson.

Reflection

Today I found out  ...

It was interesting …

It was difficult…

I understand that…

Notes.

Differentiation – how do you plan to give more support? How do you plan to challenge the more able learners?

Assessment – how are you planning to check students’ learning?

Health and safety regulations

Problem solving activity is based on various level of ability

Marking Scheme provided

Reflection

Were the lesson objectives/learning objectives realistic? Did all learners achieve the LO?

If not, why?

Did my planned differentiation work well?

Did I stick to timings?

What changes did I make from my plan and why?

Use the space below to reflect on your lesson. Answer the most relevant questions from the box on the left about your lesson. 

Summary evaluation

What two things went really well (consider both teaching and learning)?

1:

2:

What two things would have improved the lesson (consider both teaching and learning)?

1:

2:

What have I learned from this lesson about the class orachievements/difficulties of individuals that will inform my next lesson?