Devices and energy - concept 1 - unit 3 - Junior 4 - grade 4 скачать в хорошем качестве

Devices and energy - concept 1 - unit 3 - Junior 4 - grade 4

لتحميل الورق ملف PDF : https://drive.google.com/file/d/1Puih... Energy chains video:    • Energy Chains -Junior 4 - Grade 4 -   Devices and Energy Remote controlled cars It has batteries (resource of chemical energy) Chemical energy  Electrical Energy  kinetic energy or Sound energy. Batteries can be recharged by using charger or by replacing them. Mars exploration rovers curiosity Uses solar panels and batteries (charged by solar energy.) Solar energy  electrical energy (to charge rover batteries)  kinetic energy and thermal (heat) energy. The electrical energy from batteries powers the vehicle’s sensors and the electrical energy transformed into kinetic energy and thermal energy as the vehicle moves across mar’s surface. Energy can be converted/changed/transformed from one form to another. How does energy change (Transform)? Consumed(used) energy “input energy” Produced energy “output energy” Hair Dryer Electrical Thermal and sound energies Soap dispenser Potential energy (stored in the spring of the soap dispenser) Kinetic energy (the movement of the soap upward) Washing machine Electrical energy Kinetic energy and sound energy Rubbing hands Kinetic energy Thermal energy Blender Electrical energy Sound and kinetic energy Television Electrical energy Sound and light energies Energy chain It is a way to describe or represent the energy flow that occurs when we use different devices. Energy chains often start with the sun Energy chain of eating food Light energy (from sun) to grow plants chemical energy (stored in plant)  kinetic energy (movement of human body) Energy Chain when heating a pot of water Light energy (from sun) to grow trees  chemical energy (stored inside trees) thermal energy (when burning wood of trees to heat the water inside the pot) Energy chain in hair dryer Light energy (from sun) to grow trees chemical energy (stored in coal from tree remains)  thermal and kinetic energy (in electric power stations)  electrical energy  thermal and sound energy (in hair dryer) Energy chain while riding bike Chemical energy stored in food  kinetic energy  thermal energy (tire friction with road) Energy chain in light bulb switched on Electric energy (in wires)  light and thermal energy (in light bulb) Energy chain in Mobile phone Electrical energy (when charging battery) chemical energy (stored in battery) sound and light energies Note: Not all energy in energy chain reaches device Some energy is lost (escape) while travelling through the energy chain as it is converted into other forms of energy. This is because energy is not destroyed but converts / changes / transforms from one form to another that the device doesn’t use. Most of lost energy leaks out in the form of heat. Energy Of Everyday Devices? DEVICE FUNCTION CONSUMED ENERGY (USED) Produced Energy Electric bulb Lighting up Electrical energy Light energy and thermal energy Battery powered clock Showing time Chemical energy Kinetic energy Flashlight Lighting up Chemical energy Light and thermal energy Hand bell Alerting Kinetic energy Sound energy Electric heater Warming Electrical energy Thermal energy Energy path tracking: All energy comes in device (input energy) All energy comes out device (output energy) Input energy of a device = output energy of device (according to the law of conservation of energy) Example: 1- Hair dryer (drying hair) Input energy: electrical energy Output energy: thermal, sound and kinetic. Wasted energy  sound energy (noise of hair dryer considered wasted energy because sound energy doesn’t help device do its main function. 2- Mobile phone: Input energy: electrical energy Output energy: light, sound and thermal (when using mobile phone for long time). Wasted energy  heat energy (when using it for long time that doesn’t help device do its main function.)