Powerpoint lecture covering the following in a modern, concise format: 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 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: 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 Lectures are available.

Complete set of concise, modern presentations for Edexcel IGCSE Physics (4PH1) Chapter 6 - Magnetism and Electromagnetism. Contains colour coded specification points. Three presentations included: 25 - Magnetism 26 - Electromagnets Part 1 27 - Electromagnets Part 2

Powerpoint lecture covering the following in a modern, concise format: 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 Lectures are available.

Complete set of concise, modern presentations for Edexcel IGCSE Physics (4PH1) Chapter 1 - Forces and Motion. Contains colour coded specification points. Eight presentations included: 1 - Distance and Speed 2 - Acceleration 3 - Forces 4 - Balanced and Unbalanced Forces 5 - Gravity, Weight and Drag 6 - Hooke’s Law 7 - Momentum 8 - Forces and Moments

Powerpoint lecture covering the following in a modern, concise format: 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 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 6.1 - Use the following units: ampere (A), volt (V) and watt (W). Specification Point 6.2 - Know that magnets repel and attract other magnets and attract magnetic substances. Specification Point 6.3 - Describe the properties of magnetically hard and soft materials. Specification Point 6.4 - Understand the term magnetic field line. Specification Point 6.5 - Know that magnetism is induced in some materials when they are placed in a magnetic field. Specification Point 6.6 - Practical: investigate the magnetic field pattern for a permanent bar magnet and between two bar magnets. Specification Point 6.7 - Describe how to use two permanent magnets to produce a uniform magnetic field pattern. Complete set of Chapter 6 Lectures are available.

Complete set of concise, modern presentations for Edexcel IGCSE Physics (4PH1) Chapter 5 - Solids, Liquids and Gases. Contains colour coded specification points. Three presentations included: 22 - Density and Pressure 23 - Changes of State 24 - Ideal Gases

Powerpoint lecture covering the following in a modern, concise format: 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 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.11 - Know that a fuel is a substance that, when burned, releases heat energy. Specification Point 4.12 - Know the possible products of complete and incomplete combustion of hydrocarbons with oxygen in the air. Specification Point 4.13 - Understand why carbon monoxide is poisonous, in terms of its effect on the capacity of blood to transport oxygen. Specification Point 4.14 - Know that, in car engines, the temperature reached is high enough to allow nitrogen and oxygen from air to react, forming oxides of nitrogen. Specification Point 4.14 - Know that, in car engines, the temperature reached is high enough to allow nitrogen and oxygen from air to react, forming oxides of nitrogen. Specification Point 4.15 - Explain how the combustion of some impurities in hydrocarbon fuels results in the formation of sulphur dioxide. Specification Point 4.16 - Understand how sulphur dioxide and oxides of nitrogen contribute to acid rain. Specification Point 4.17 - Describe how long-chain alkanes are converted to alkenes and shorter-chain alkanes by catalytic cracking. Specification Point 4.18 - Explain why cracking is necessary, in terms of the balance between supply and demand for different fractions. Complete set of Chapter 7 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 5.8P - Explain why heating a system will change the energy stored within the system and raise its temperature or produce changes of state. Specification Point 5.9P - Describe the changes that occur when a solid melts to form a liquid, and when a liquid evaporates or boils to form a gas. Specification Point 5.10P - Describe the arrangement and motion of particles in solids, liquids and gases. Specification Point 5.11P - Practical: obtain a temperature–time graph to show the constant temperature during a change of state. Specification Point 5.12P - Know that specific heat capacity is the energy required to change the temperature of an object by one degree celsius per kg of mass. Specification Point 5.13P - Use an equation to derive the change in thermal energy in a system. Specification Point 5.14P - Practical: investigate the specific heat capacity of materials including water and some solids. Complete set of Chapter 5 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: 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 Lectures are available.

Complete set of concise, modern presentations for Edexcel IGCSE Physics (4PH1) Chapter 4 - Energy Resources and Transfer. Contains colour coded specification points. Four presentations included: 18 - Energy 19 - Thermal Energy 20 - Work and Power 21 - Sources of Energy

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.18P - Describe the energy transfers involved in generating electricity. Specification Point 4.19P - Describe the advantages and disadvantages of methods of large-scale electricity production from various renewable and non-renewable resources. Complete set of Chapter 4 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.11 - Know and use the relationship between work done, force and distance moved in the direction of the force. Specification Point 4.12 - Know that work done is equal to energy transferred. Specification Point 4.13 - Know and use the relationship between gravitational potential energy, mass, gravitational field strength and height. Specification Point 4.14 - Know and use the relationship between kinetic energy, mass and speed. Specification Point 4.15 - Understand how conservation of energy produces a link between gravitational potential energy, kinetic energy and work. Specification Point 4.16 - Describe power as the rate of transfer of energy or the rate of doing work. Specification Point 4.17 - Use the relationship between power, work done and time taken. Complete set of Chapter 4 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.6 - Describe how thermal energy transfer may take place by conduction, convection and radiation. Specification Point 4.7 - Explain the role of convection in everyday phenomena. Specification Point 4.8 - Explain how emission and absorption of radiation are related to surface and temperature. Specification Point 4.9 - Practical: investigate thermal energy transfer by conduction, convection and radiation. Specification Point 4.10 - Explain ways of reducing unwanted energy transfer, such as insulation. Complete set of Chapter 4 Lectures are available.

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.

Complete set of concise, modern presentations for Edexcel IGCSE Physics (4PH1) Chapter 3 - Waves. Contains colour coded specification points. Four presentations included: 14 - Waves 15 - Electromagnetic Waves 16 - Reflection and Refraction 17 - Sound Waves

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.1 - Know that chemical reactions in which heat energy is given out are described as exothermic, and those in which heat energy is taken in are described as endothermic. Specification Point 3.2 - Describe simple calorimetry experiments for reactions such as combustion, displacement, dissolving and neutralisation. Specification Point 3.3 - Calculate the heat energy change from a measured temperature change using the expression Q = mcΔT. Specification Point 3.4 - Calculate the molar enthalpy change (ΔH) from the heat energy change, Q. Specification Point 3.8 - Practical: investigate temperature changes accompanying some of the following types of change: salts dissolving in water, neutralisation reactions, displacement reactions and combustion reactions. Complete set of Chapter 6 Lectures are available.