calculations of the cost of work and power of household appliances

Long-term plan section:

School:

10.3V - Direct Current

Full name of the teacher:

Date:

Number present:

absent:

Lesson topic

Work and power of electric current

Learning objectives that are achieved in this lesson (link to the curriculum)

10.3.2.4 - to make practical calculations of the cost of work and power of household appliances

Lesson objectives

make practical calculations of the cost of work and power of household appliances

Evaluation Criteria

- calculates the consumption of electric current and its cost;

- calculates the power of household appliances;

- lists ways to save energy;

Language goals

Vocabulary and terminology:

Instilling values

As a result of the assimilation of physical knowledge, the foundations of a scientific worldview are laid, which presupposes a deep understanding of natural phenomena, an ability to independently explain and describe these phenomena in an academic language, to set goals and plan their achievement.

Interdisciplinary communication

Interdisciplinary connection with mathematics

ICT skills

Work with an interactive board

Preliminary knowledge

Work and power of electric current

During the classes

Scheduled Lesson Stages

Scheduled Lesson Activities

Resources

Start
0-1 min

Organizing time

Presentation

1-5 min

Starter: what is shown in the picture?

Where does electricity come from in our house and what role does it play in our lives?
What types of energy can electrical energy be converted to? Give examples

Today, the life of people cannot be imagined without household appliances. Modern technology is entirely based on electricity. And its consumption is constantly increasing.
Announcement of the topic of the lesson. Declaring the goal of the lesson.

Presentation

5-25 min

1.      1. Actualization of knowledge:
2. What is the work of electric current? Units of measurement work?
3. What is the power of electric current? Units of power?
4. How can I express the work of electric current through power and time?

2.       

3.       What devices help measure current performance? What device shows us the amount of energy consumed?
How is the consumption of electricity in the home?
To calculate the electricity consumed use electric meters, which are installed on the panel for each apartment. The counter disk rotates only when at least one electricity consumer is switched on. The speed of rotation of the disk depends on the total power of the included consumers.
The most powerful, and therefore consume a greater amount of electricity, are electric heaters (electric stoves, irons, water heaters, washing machines, air conditioners, microwave ovens, etc.). Presentation of devices.

4.       

5.       

6.       

Consider the unit of measurement work applied in practice.

7.      Despite the fact that the cost of electricity consumed per one 100-watt light bulb is not very high, in the scale of a modern apartment a considerable amount can accumulate in a month.
- Guys, do you know? How much does your family spend on electricity bills per month?
- How many of you can calculate the cost of energy consumed? (creating a problem situation)

Consider 2 ways to determine the calculation of the cost of electricity consumed:
1. The first way to determine the consumption and cost of electrical energy (by meter): to calculate the electricity at home you need to know the readings of the electricity meter and its tariff. To determine the cost of electricity per month by meter, you need to determine the current and previous meter readings, find the amount of electrical energy (subtract the previous meter from the current one). Multiply the tariff for the difference in readings and find the cost of electricity.

2. The second way to determine the consumption and cost of electrical energy (without a meter):

Presentation

25-45 min

Problem solving

Task 1. There is an electric lamp, designed for a current of 100 watts. The lamp is lit daily for 6 hours. In the office of 30 lamps. Find the current work for one month (30 days) and the cost of energy consumed at a tariff of 8.43 tenge per 1 kWh.

Task 2. There is an electric lamp, designed for a current of 100 watts. The lamp is lit daily for 6 hours. In the office of 30 lamps. The school has 50 classrooms. Find current work for one month (30 days) and the cost of energy consumed at a rate of 13.64 tenge per 1 kWh.

Task 3. There is an electric stove, designed for a current capacity of 10,000 watts. Daily working for 10 hours. In the dining room 4 plates. Find current work for one month (30 days) and the cost of energy consumed at a rate of 13.64 tenge per 1 kWh.

Task 4. In the office of computer science 15 computers with a capacity of 800 watts, which operate for 5.5 hours per day. What is the power consumption for 24 working days? The cost of electricity for the period at a cost of 13.64 tenge / kW · h.

Task 5. Iron power 1200 watts. Calculate the current work for 15 minutes of work. Translate the resulting value in kWh. Calculate how much you will pay for using this iron for 15 minutes of continuous operation at a rate of 11 tenge 53 tiyn.
Task 6. In the household electric cooker, designed for a voltage of 220 V, there are two spirals, the resistance of each of which in the operating mode is 80.7 Ohms. With the help of a switch, one helix, two helixs in series or two helixes in parallel can be included in the network. Find power in each case.
Task 7. Explain why, when two lamps of 40 and 100 W are switched on in series, the first one burns much brighter than the second.

Presentation

45-55 min

Presentation

55-65 min

Creating a problem situation:

1. Why do I need to save electricity?
2. Does the power consumption depend on the season?
3. Do we need you to be rational and careful with electricity?
4. What are some ways to save energy?
Consider the benefits of energy-saving lamps and compare incandescent, fluorescent and LED lamps.

Summarizing and supplementing the students' answers, the teacher formulates the following rules for economical electricity consumption:
• do not include lighting and electric heaters without the need; use the economy mode of household appliances (washing machines, electric stoves, vacuum cleaners); when leaving the apartment, make sure that all electrical appliances are turned off (this rule is at the same time the rule of fire safety).
Economical use of electricity will reduce the use of energy resources and reduce emissions of harmful substances into the atmosphere, to maintain the purity of water bodies.

Presentation

65-78 min

Groupwork

Presentation

78-80 min

Reflection
H/w: determine the cost of electricity by the counter

Differentiation - how do you plan to provide more support? What tasks do you plan to set for more capable students?

Grading - how do you plan to check students' level of learning?

Health & Safety

More able students to propose tasks with a high level of complexity.

Evaluation will be done at each stage of the lesson (mutual evaluation, self-evaluation)

Health and safety: Compliance with the rules of conduct in the office.

Lesson reflexion

Were the objectives of the lesson / learning objectives realistic?

Have all students reached the DH?

If not, why not?

Is the differentiation correct in the lesson?

Have the lesson temporal stages been sustained?

What were the deviations from the lesson plan and why?

Use this section to reflect on the lesson. Answer the most important questions about your lesson from the left column.

Overall rating

What are two aspects of the lesson that went well (think about both teaching and learning)?

one:

2:

What could contribute to improving the lesson (think about both teaching and learning)?

one:

2:

What did I discover during the lesson about the class or the achievements / difficulties of individual students, what should I look for in subsequent lessons?