Heat and Temperature
This lesson covers the definitions of heat and temperature, their differences, and the effects of heat on substances. It explains the kinetic molecular theory and how heat causes changes in state, such as solid to liquid and liquid to gas.
- 24:51 “Thank you for watching. My name is Mr. Bello, AA Till next time. [Music]”
- 00:48 “Lastly, briefly explain thermal expansivity. Heat energy. Heat energy is a result of movement of tiny particles called atoms, molecules, or ion in solid, liquid, and gas. Heat energy can be transferred from one object to...”
- 24:02 “1 1 multiplied by 60 minus 30. So, this is a 0.001, multiplied by 250,000 multiplied by 30. So, our change in length, as a result of that temperature difference is 82.5 meter. Evaluation, at the end of the lesson, we are...”
Work, Energy and Power
This lesson covers the definitions of work, energy, and power. It explains potential and kinetic energy as forms of mechanical energy. The lesson also includes calculations related to work done and the concept of power as the rate of doing work.
- 06:28 “It is expressed in terms of watts. So the formula is work done divided by time, that is W over C. Now, there are different forms of energy that is energy exists in different forms. The first one is heat energy. This part...”
- 08:14 “So, the principle in which human beings can observe something, for example, I'm staring at the screen and I can see what is written on the screen because light falls on my eyes and reflects directly on the screen, allowi...”
- 20:14 “Thanks for watching. My name is Uche Ugo, till next class.”
Sources of Energy
The lesson covers different sources of energy, including renewable and non-renewable types. It explains how energy is used in society and discusses the environmental impacts of various energy sources. Specific examples include petroleum, natural gas, solar energy, and wind energy.
- 02:23 “We have nuclear energy, these are the release of energy in the society. When we release energy into the society, is the nuclear energy. We have the solar energy that is energy got it from the sun, that is what we call th...”
- 07:01 “to take place, water will come in contact with a hot rock of the earth's surface. If these two substances come together, it will produce the geothermal. And the thermal itself means heat. And by so doing it will produce...”
- 18:48 “increase in temperature, what is temperature? The degree of hotness or coldness. It might be a hotness in the edge or it might be hotness, it might be coldness. That's what I was saying about global warming. It's simply...”
Work, Energy and Power
This lesson covers the definitions of work, energy, and power. It includes calculations for work done, gravitational potential energy, and power in watts. The lesson also distinguishes between kinetic and potential energy and explains energy transformation and the law of conservation of energy.
- 10:30 “Take, for example, hot water and cold water. The temperature difference between them, most of the way, you pour hot water or cold water in hot water, the hot water will supply heat to the cold water. So that at the end o...”
- 09:43 “That is how to calculate the work done. When an object is raised to a particular height, h. Now, energy, energy is the ability to do work. It is a scalar quantity. And the unit of energy is joule. That is, energy is also...”
- 12:53 “between two objects, due to their masses. Also, we have chemical energy. This is energy given by a charge particles called electrons. For example, lightning. It's an example of electrical energy in nature. Another form o...”
Magnetic Fields
This lesson covers the concept of magnetic fields, including types of magnets such as bar magnets. It explains the flow of magnetic forces from the North pole to the South pole and the principles of attraction and repulsion between magnets. The lesson also touches on how to create a magnet and the c
- 16:40 “Like this. These are AC. We can use it to destroy the magnets. It also, it's solenoid also, giving to Ross. An AC, that is only thing that can be added to, we need to destroy the magnets. Using an AC, we can destroy the...”
- 01:37 “Now, these are areas of the North Seeking Pool and the South Seeking Pool. It simply means that the flocks are leaving from the North Pool and they're entering into the South Pool. It simply means that you also have it t...”
- 24:38 “There's always also a repulsion. This is gray knots, this is gray knots, this is gray knots, this is gray knots. There's always a repulsion. We have this also coming in, coming in. We have this also coming in. There's al...”