Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.1 - Use a variety of energy units. Specification Point 4.2 - Describe energy transfers involving energy stores. Specification Point 4.3 - Use the principle of conservation of energy. Specification Point 4.4 - Know and use the relationship between efficiency, useful energy output and total energy output. Specification Point 4.5 - Describe a variety of everyday and scientific devices and situations, explaining the transfer of the input energy in terms of the above relationship, including their representation by Sankey diagrams. Complete set of Chapter 4 Lectures are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 3.22 - Understand that most phenotypic features are the result of polygenic inheritance rather than single genes. Specification Point 3.23 - Describe patterns of monohybrid inheritance using a genetic diagram. Specification Point 3.24 - Understand how to interpret family pedigrees. Specification Point 3.25 - Predict probabilities of outcomes from monohybrid crosses. Specification Point 3.26 - Understand how the sex of a person is controlled by one pair of chromosomes, XX in a female and XY in a male. Specification Point 3.27 - Describe the determination of the sex of offspring at fertilisation, using a genetic diagram. Complete set of Chapter 5 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 3.10B - Understand the roles of FSH and LH in the menstrual cycle. Complete set of Chapter 5 Lessons are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 1.1 - Understand the hydrological cycle: characteristics, stores and transfers. Complete set of Chapter 1 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.46 - Describe the structure of the thorax, including the ribs, intercostal muscles, diaphragm, trachea, bronchi, bronchioles, alveoli and pleural membranes. Specification Point 2.47 - Understand the role of the intercostal muscles and the diaphragm in ventilation. Complete set of Chapter 3 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.10B - Understand the roles of FSH and LH in the menstrual cycle. Complete set of Chapter 5 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.6.2.3 - Selective breeding. Complete set of Chapter 6 Lectures are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 3.31 - Understand how random fertilization produces genetic variation of offspring. Specification Point 3.32 - Know that in human cells the diploid number of chromosomes is 46 and the haploid number is 23. Specification Point 3.33 - Understand that variation within a species can be genetic, environmental, or a combination of both. Specification Point 3.34 - Understand that mutation is a rare, random change in genetic material that can be inherited. Complete set of Chapter 5 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 4.1 - Understand the terms population, community, habitat and ecosystem. Specification Point 4.2 - Practical: investigate the population size of an organism in two different areas using quadrats. Complete set of Chapter 6 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 5.12 - Understand how restriction enzymes are used to cut DNA at specific sites and ligase enzymes are used to join pieces of DNA together. Specification Point 5.13 - Understand how plasmids and viruses can act as vectors, which take up pieces of DNA, and then insert this recombinant DNA into other cells. Specification Point 5.14 - Understand how large amounts of human insulin can be manufactured from genetically modified bacteria that are grown in a fermenter. Specification Point 5.15 - Understand how genetically modified plants can be used to improve food production. Specification Point 5.16 - Understand that the term transgenic means the transfer of genetic material from one species to a different species. Complete set of Chapter 7 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 4.3B - Understand the term biodiversity. Specification Point 4.4B - Practical: investigate the distribution of organisms in their habitats and measure biodiversity using quadrats. Complete set of Chapter 6 Lessons are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.1.1.1 - Fundamental particles. Complete set of Chapter 1 Lectures are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 5.9B - Understand the methods used to farm large numbers of fish to provide a source of protein, including maintaining water quality, controlling intraspecific and interspecific predation, controlling disease, removing waste products, controlling the quality and frequency of feeding, and selective breeding. Complete set of Chapter 7 Lessons are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 24 - Ideal Gases. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 5.15 - Explain how molecules in a gas have random motion and that they exert a force and hence a pressure on the walls of a container. Specification Point 5.16 - Understand why there is an absolute zero of temperature which is –273 °C. Specification Point 5.17 - Describe the Kelvin scale of temperature and be able to convert between the Kelvin and Celsius scales. Specification Point 5.18 - Understand why an increase in temperature results in an increase in the average speed of gas molecules. Specification Point 5.19 - Know that the Kelvin temperature of a gas is proportional to the average kinetic energy of its molecules. Specification Point 5.20 - Explain, for a fixed amount of gas, the qualitative relationship between: pressure and volume at constant temperature, pressure and Kelvin temperature at constant volume. Specification Point 5.21 - Use the relationship between the pressure and Kelvin temperature of a fixed mass of gas at constant volume. Specification Point 5.22 - Use the relationship between the pressure and volume of a fixed mass of gas at constant temperature. Complete set of Chapter 5 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 22 - Density and Pressure. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 5.3 - Know and use the relationship between density, mass and volume. Specification Point 5.4 - Practical: investigate density using direct measurements of mass and volume. Specification Point 5.5 - Know and use the relationship between pressure, force and area. Specification Point 5.6 - Understand how the pressure at a point in a gas or liquid at rest acts equally in all directions. Specification Point 5.7 - Know and use the relationship for pressure difference. Complete set of Chapter 5 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 26 - Electromagnets Part 1. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 6.8 - Know that an electric current in a conductor produces a magnetic field around it. Specification Point 6.12 - Understand why a force is exerted on a current-carrying wire in a magnetic field, and how this effect is applied in simple D.C. electric motors and loudspeakers. Specification Point 6.13 - Use the left-hand rule to predict the direction of the resulting force when a wire carries a current perpendicular to a magnetic field. Specification Point 6.14 - Describe how the force on a current-carrying conductor in a magnetic field changes with the magnitude and direction of the field and current. Specification Point 6.15 - Know that a voltage is induced in a conductor or a coil when it moves through a magnetic field or when a magnetic field changes through it and describe the factors that affect the size of the induced voltage. Specification Point 6.16 - Describe the generation of electricity by the rotation of a magnet within a coil of wire and of a coil of wire within a magnetic field, and describe the factors that affect the size of the induced voltage. Complete set of Chapter 6 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 28 - Radioactivity Part 1. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 7.1 - Use the following units: becquerel (Bq), centimetre (cm), hour (h), minute (min) and second (s). Specification Point 7.2 - Describe the structure of an atom in terms of protons, neutrons and electrons. Specification Point 7.3 - Know the terms atomic number, mass number and isotope. Specification Point 7.4 - Know that alpha particles, beta particles and gamma rays are ionising radiations emitted from unstable nuclei in a random process. Specification Point 7.5 - Describe the nature of alpha particles, beta particles, and gamma rays, and recall that they may be distinguished in terms of penetrating power and ability to ionise. Specification Point 7.6 - Practical: investigate the penetration powers of different types of radiation using either radioactive sources or simulations. Specification Point 7.7 - Describe the effects on the atomic and mass numbers of a nucleus of the emission of each of the four main types of radiation (alpha, beta, gamma and neutron radiation). Specification Point 7.8 - Understand how to balance nuclear equations in terms of mass and charge. Complete set of Chapter 7 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 29 - Radioactivity Part 2. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 7.10 - Explain the sources of background radiation from Earth and space. Specification Point 7.11 - Know that the activity of a radioactive source decreases over a period of time and is measured in becquerels. Specification Point 7.12 - Know the definition of the term half-life and understand that it is different for different radioactive isotopes. Specification Point 7.13 - Use the concept of the half-life to carry out simple calculations on activity, including graphical methods. Specification Point 7.14 - Describe uses of radioactivity in industry and medicine. Specification Point 7.15 - Describe the difference between contamination and irradiation. Specification Point 7.16 - Describe the dangers of ionising radiations and how to dispose of radioactive waste. Complete set of Chapter 7 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 27 - Electromagnets Part 2. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 6.9P - Describe the construction of electromagnets. Specification Point 6.10P - Draw magnetic field patterns for a straight wire, a flat circular coil and a solenoid when each is carrying a current. Specification Point 6.11P - Know that there is a force on a charged particle when it moves in a magnetic field as long as its motion is not parallel to the field. Specification Point 6.17P - Describe the structure of a transformer, and understand that a transformer changes the size of an alternating voltage by having different numbers of turns on the input and output sides. Specification Point 6.18P - Explain the use of step-up and step-down transformers in the large-scale generation and transmission of electrical energy. Specification Point 6.19P - Know and use the relationship between input and output voltages and the turns ratio for a transformer. Specification Point 6.20P - Know and use the relationship between input power and output power. Complete set of Chapter 6 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 32 - The Evolution of Stars. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 8.7 - Understand how stars can be classified according to their colour. Specification Point 8.8 - Know that a star’s colour is related to its surface temperature. Specification Point 8.9 - Describe the evolution of stars of similar mass to the Sun through the following stages: nebula, star, red giant and white dwarf. Specification Point 8.10 - Describe the evolution of stars with a mass larger than the Sun. Complete set of Chapter 8 Lectures are available. Complete set of Chapter 8 Worksheets are available.