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Solution to Exercise 1 page 49 Physics 11 textbook
Problem:
What force measures the electrical energy consumed by a circuit? Write the formula to calculate the consumed electrical energy and electrical power of a circuit when current flows through.
Solution:
The electrical energy consumed by a circuit is measured by the force of the electric field. Formula to calculate consumed electrical energy: A = Uq= Uit.
Formula to calculate electrical power:
Solution to Exercise 2 on page 49 of Physics 11 Textbook
Problem:
State a tool or electrical device for each of the following cases:
a) When converting electrical energy into heat energy and light energy.
b) When converting all electrical energy into heat energy.
c) When converting electrical energy into mechanical energy and heat energy.
d) When converting electrical energy into chemical energy and heat energy.
Solution:
a) When converting electrical energy into heat energy and light energy.
- Microwave oven, electric bulb
b) When converting all electrical energy into heat energy.
- Electric iron (ironing board)
c) When converting electrical energy into mechanical energy and heat energy.
- Electric fan, electric motor.
d) When converting electrical energy into chemical energy and heat energy.
- Electrolysis cell used in electroplating.
Solution to Exercise 3 on page 49 of Physics 11 Textbook
Question:
What is the heat dissipation power of a circuit and how is it calculated?
Solution:
Công suất tỏa nhiệt P của một đoạn mạch khi có dòng điện chạy qua đặc trưng cho tốc độ tỏa nhiệt của một đoạn mạch đó được tính bằng nhiệt lượng tỏa ra ở của một đoạn mạch dẫn đó trong một đơn vị thời gian. Công thức:
Solution to Exercise 4 on page 49 of Physics 11 Textbook
Question:
What is the relationship between the power of the power source and the electrical energy consumed in a closed circuit? Write the formulas to calculate the work and power of the power source.
Lời giải:
Công của nguồn điện bằng với công suất tiêu thụ điện năng trong toàn mạch. Công thức:
Exercise 5 Solution from Physics 11 Textbook Page 49
Question:
Select the correct sentence.
Electrical energy consumption is measured by:
A. Voltmeter.
B. Electricity meter.
C. Ammeter.
D. Electrostatic meter.
Answer: B.
Explanation:
The electricity meter is a tool for measuring electrical energy consumption.
Solution to Exercise 6 on page 49 Physics 11 Textbook
Problem:
Electrical power is measured in which of the following units?
A. Joule (J).
B. Watt (W)
C. Newton (N).
D. Coulomb (C).
Solution:
The answer is B.
Electrical power is measured in the unit Watt (W).
Exercise 7 Solution from Physics 11 Textbook Page 49
Problem:
Calculate the electrical energy consumption and electrical power when a current of 1A flows through a conductor for one hour, given that the voltage drop across the conductor is 6V.
Solution:
Exercise 8 Solution from Physics 11 Textbook Page 49
Problem Statement:
The label on an electric kettle reads 220V - 1000W.
a) Explain the significance of the numbers stated here.
b) Using the electric kettle with a voltage of 220V, boil 2 liters of water from a temperature of 25°C. Calculate the boiling time, given the kettle's efficiency is 90% and the specific heat capacity of water is 4190 J/(kg.K).
Solution:
a) Interpretation of the numbers on the kettle:
+ 220V represents the rated voltage of the kettle. When connected to the kettle with a voltage of 220V, it operates normally.
+ 1000W is the electrical power consumption of the electric kettle when operated at 220V voltage.
b)
Solution to Exercise 9 on page 49 of Physics Grade 11 textbook
Problem Statement:
A power source has an electromotive force of 12V. When connected to a light bulb to form a closed circuit, it provides a current of 0.8A. Calculate the energy supplied by this power source over a period of 15 minutes and determine the power of the power source at that time.
Solution:
In the Grade 11 Physics curriculum, Chapter I, Electric Charge, Electric Field, students will study Direct Current, Power Sources. Let's solve exercises on pages 44 and 45 of Physics Grade 11 to grasp this lesson effectively.
The method to solve some problems on circuits is the next lesson of Chapter I, Electric Charge, Electric Field in Grade 11 Physics. Let's also refer to the hints for exercises on page 62 of Physics Grade 11 to master the knowledge and study Physics Grade 11 well.
