fizikzauglom

GRADE 8

Grade 8 Physics Lessons

Thermal processes, electrical circuits, magnetism and electromagnetic induction. Grade 8 physics topics and lessons with theory, physical quantities, formulas, and related problems.

11 those28 lessons

Thermal phenomena

MCT, temperature, internal energy and heat transfer.

4
Kinetic particle theory and surface phenomena22 min · The ideas of kinetic particle theory, states of matter, wetting and capillaries.Temperature and internal energy22 min · Thermal equilibrium, temperature scales and ways to change internal energy.Thermal conduction, convection and radiation20 min · Three methods of heat transfer and their uses.Heat and thermal energy balance28 min · Specific heat capacity, calorimetry, fuel and energy conservation.

Change in state of aggregation

Melting, evaporation, moisture and boiling.

3
Melting, solidification and graphs24 min · Melting temperature and energy of a phase change.Evaporation, condensation and humidity24 min · Saturated vapour and measuring relative humidity.Boiling and vaporization22 min · Boiling temperature, pressure and specific latent heat of vaporization.

Heat engines

Gas operation, engine design and efficiency.

2
Work done by gas and how engines work22 min · Gas expansion, the internal combustion engine and the steam turbine.Heat engine efficiency and the environment20 min · Energy conversion, inevitable losses and environmental consequences.

Charge and electric field

Electrification, atom, law of conservation of charge and field.

3
Charging, conductors and dielectrics20 min · Two signs of charge, the electroscope and charge redistribution.Atomic structure and charge conservation22 min · Electrons, ions, charge quantization and charge conservation.Charge interaction and electric field26 min · Coulomb's law, electric field strength, and uses and hazards of static electricity.

Electric current

Sources, circuits, current and voltage.

2
Electric current and circuit22 min · Conditions for the existence of current, sources, direction and effects of current.Current, voltage and measuring instruments26 min · Ammeters, voltmeters and safe connections.

Resistance and Ohm's Law

Conductor resistance, Ohm's law and rheostat.

2
Resistance and Ohm's Law24 min · Relationship between current, voltage and resistance of a circuit section.Conductor resistance and rheostat24 min · Material, length, cross-section and current regulation.

Conductor connections

Series, parallel and mixed circuits.

2
Series connection22 min · Current, voltage and equivalent resistance of a series circuit.Parallel and mixed connection26 min · Current splitting, shared voltage and basic series-parallel circuits.

Work and current power

Electrical energy, heating and safety.

2
Work, power and energy consumption24 min · Electrical work, appliance power and household energy metering.Thermal effect of current and safety24 min · Joule-Lenz law, heaters, short circuits and protection.

Magnetic phenomena

Magnetic fields, electromagnets and motor.

2
Magnetic field and electromagnet22 min · Permanent magnets, the magnetic field of current, coils and uses of electromagnets.Magnetic field action and motor24 min · The Earth's field, the left-hand rule and the principle of the electric motor.

Electromagnetic induction

Induction current, Lenz's rule and energy production.

2
Electromagnetic induction and Lenz's law24 min · Magnetic flux and the origin and direction of induced current.Generators and electrical energy transmission24 min · Conversion of mechanical energy and transmission with changes in voltage.

Light phenomena

Light sources, propagation, reflection, refraction and lenses.

4
Sources and properties of light18 min · Natural and artificial sources, effects of light and its energy.Propagation of light20 min · Light rays, straight-line propagation, umbra and penumbra.Reflection of light and mirrors22 min · The law of reflection and the construction of an image in a plane mirror.Refraction and lenses24 min · Changes in light direction, lens focus and image construction.