# Physics 9

## Physics 9 Lesson 61: Power generation – thermal and hydroelectric power

Physics 9 Lesson 61: Power generation – thermal and hydroelectric power 1. Theoretical Summary 1.1. The role of electricity in life and production Electricity is easily converted into other forms of energy. Electrical energy converted to mechanical energy Electricity converted to heat Electrical energy converted into light energy Electrical energy converted into chemical energy – …

## Physics 9 Lesson 62: Wind power – Solar power – Nuclear power

Physics 9 Lesson 62: Wind power – Solar power – Nuclear power 1. Theoretical Summary 1.1. Wind generator Wind energy is the kinetic energy of air moving through the Earth’s atmosphere. – The propeller is attached to the rotating shaft of the generator’s rotor. The stator is the electric coil. The blowing wind imparts mechanical …

## Physics 9 Lesson 60: Law of conservation of energy

Physics 9 Lesson 60: Law of conservation of energy 1. Theoretical Summary 1.1. Energy transformation in mechanical, thermal, and electrical phenomena a) Convert potential energy into kinetic energy and vice versa. Loss of energy – In mechanical processes, mechanical energy is always reduced, the lost mechanical energy has been converted into heat energy. If the …

## Reason 9 Lesson 33: Alternating current

Physics 9 Lesson 33: Alternating current 1. Theoretical Summary 1.1. Direction of induced current ⇒ Alternating current that changes direction as above is called alternating current. 1.2. how to create alternative electricity – Let the magnet rotate before the closed coil. – Let the coil of wire rotate in a magnetic field. Conclusion: – In …

## Physics 9 Lesson 34: Alternator

Physics 9 Lesson 34: Alternator 1. Theoretical Summary 1.1. Structure and operation of an alternator The alternator has two main parts: Magnets to generate magnetic fields, which can be permanent magnets or electromagnets. Conductor coil to generate alternating current. One of the two parts that are stationary is called the stator, the other that can …

## Reason 9 Lesson 32: Conditions for the appearance of induced current

Physics 9 Lesson 32: Conditions for the appearance of induced current 1. Theoretical Summary 1.1. Variation of the number of magnetic field lines through the cross-section of the coil When bringing a pole of a magnet close to or away from the end of a coil, the number of magnetic lines of force through the …

## Reason 9 Lesson 30: Exercises to apply the right fist rule and the left hand rule

Physics 9 Lesson 30: Exercises to apply the right fist rule and the left hand rule 1. Theoretical Summary 1.1. Apply the right fist rule Rule statement: Hold the right hand, and then place it so that the four fingers point in the direction of the current flowing through the loops, the thumb will show …

## Physics 9 Lesson 31: Electromagnetic induction phenomenon

Physics 9 Lesson 31: Electromagnetic induction phenomenon 1. Theoretical Summary 1.1. Structure and operation of dynamo in bicycle a) Structure: A magnet Coil b) Activities: When turning the knob of the dynamo, the magnet rotates and the light is on 1.2. Use magnets to generate electric current a) Use a permanent magnet The current appearing …