Grade 4 | Science | Unit 3 - Concept 1 - Lesson 2 - Energy chains скачать в хорошем качестве

Grade 4 | Science | Unit 3 - Concept 1 - Lesson 2 - Energy chains

Welcome dear students! How does energy change (transform) ? Device: Hair dryer Consumed energy (input energy): Electrical energy. Produced energy (output energy): Thermal energy, kinetic energy and sound energy. Device: Soap dispenser (Detergent bottle) Consumed energy (input energy): Potential energy (stored in the spring of the soap dispenser). Produced energy (output energy): Kinetic energy (the movement of the soap upward). Device: Washing machine Consumed energy (input energy): Electrical energy. Produced energy (output energy): Kinetic energy and sound energy. Note When you rub your hands, you will feel warm because kinetic energy (consumed energy) is converted into thermal energy (produced energy). Energy chain It is a way to describe the flow of energy and its conversion from one form into another. • Energy chains often start with the Sun. Energy chain when eating food : The Sun emits light energy that reaches a plant such as an orange tree. The green plant converts light energy comes from the Sun into chemical energy, which is stored in the form of sugars inside the plant. When you eat an orange, your body converts the chemical energy stored inside the fruit into kinetic energy when your body move. Light energy (From the Sun) Converted into Chemical energy (Stored inside the plant) Converted into Kinetic energy (Movement of the human body) Energy chain when heating a pot of water over a fire : Light energy comes from the Sun causes the growth of trees. This light energy is converted into chemical energy which is stored in the form of sugars inside the trees. When the wood of trees is burned, it releases thermal energy which heats the water inside the pot. Light energy (From the Sun) Converted into Chemical energy (Stored inside the trees) Converted into Thermal energy (When burning the wood of trees to heat the water inside the pot) Energy chain in a hair dryer : Light energy from the Sun causes the growth of trees. Coal is formed from the remains of dead trees that buried deep in the Earth over millions of years so, coal is a resource of energy that stores chemical energy. Coal is used in electric power stations (power plant), because : 1. When coal is burned, it produces thermal energy. 2. Then thermal energy is converted into kinetic energy which is used to operate certain devices in these stations in order to generate electrical energy. Electrical energy goes through electric copper wires until it reaches the hair dryer to be operated producing thermal energy, kinetic energy and sound energy. Light energy (From the Sun) Converted into Chemical energy (Stored inside coal formed from the remains of dead trees) Converted into Thermal energy and kinetic energy (In electric power stations) Converted into Electrical energy (Goes through electric wires) Converted into Thermal energy, kinetic energy and sound energy (In the hair dryer) Notes 1. Not all the energy in an energy chain reaches the device. 2. Some of the energy is wasted, while travelling through the energy chain, as it is converted into other forms of energy. This is because energy is not destroyed but it is converted into other forms of energy that the device does not use. 3. Most of the wasted energy leaks out in the form of heat. #Science_Grade4 #mrraoufashraf #Science #EnergyTransformation #EnergyChain #FormsOfEnergy #DailyLifeScience #FunScience #PrimaryScience MR. RAOUF ASHRAF