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.
- 13:19 “So, our potential energy will be 20 kg, which is the mass of the body multiplied by the height, which is about 8 m and the acceleration due to gravity, which is 10 Newton/kg. We obtained 1,600 joules, which is the unit o...”
- 10:42 “Remember, I said energy cannot be destroyed. Now, if you look at the diagram before you on the screen, you see a young man holding a catapult. The energy stored in this particular catapult is referred to as potential ene...”
- 12:22 “That is, the force of the body over the mass of the body. Whereas, the distance covered by the object is usually measured in kilometers or meters. Let's take an example. The question says, find the potential energy of an...”
Electric Cells and Current Electricity
The lesson covers the types of electric cells, including primary and secondary cells. It explains the concepts of electromagnetic force, current electricity, potential difference, and resistance. The arrangement of cells in series and parallel is also discussed.
- 21:58 “Let's proceed. Now, electric potential, electric potential, it is a work done in moving a unit charge from an infinity to a point of consideration. And we have the formula to be given us, V is equals to W over Q, and W i...”
- 04:15 “Now we have the EMF of a cell, we said, we are told that EMF of a cell is a total energy which a current flows through the internal resistance of the cell, and external resistance of the circuit. We have these, we have t...”
- 39:02 “Now, across the parallel combination, we have that, let's go up to check our parallel combination. We have it as 2.5, 2.5, in parallel combination, 2.5. So, we have the same, we have V, V is equal to I, R, in parallel co...”