WJEC GCSE PHYSICS Unit 1 - Energy, Electricity and Waves 0.0 / 5 ? PhysicsEnergy, Electricity and WavesGCSEWJEC Created by: MatthewDunstanCreated on: 13-06-19 16:27 TOPIC 1 - What is the National Grid? A network of power stations, power cables and transformers that supply electrical energy. 1 of 36 TOPIC 1 - Name the parts in the National Grid System? Power Station, Step Up Transformer, Pylons (suspended cables), Step Down Transformer 2 of 36 TOPIC 1 - Why are Step Up Transformers needed? To increase the voltage in order to reduce the current 3 of 36 TOPIC 1 - Why are Step Down Transformers needed? To decrease the voltage to a SAFER level for use in homes, offices etc. 4 of 36 TOPIC 1 - Renewable Energy Definition A source of energy that will not run out 5 of 36 TOPIC 1 - Non Renewable Energy Definition A source of energy that will run out 6 of 36 TOPIC 1 - Name 4 Renewable Energy Sources Wind, Solar, Hydro Electric, Tidal 7 of 36 TOPIC 1 - Name 4 Non Renewable Energy Sources Gas, Coal, Oil, Nuclear 8 of 36 TOPIC 1 - What is a Carbon Footprint The amount of carbon dioxide released into the atmosphere as a result of the activities of a particular individual, organization, or community 9 of 36 TOPIC 2 - What is conduction? The movement of heat in solids - Mainly metals because they have free electrons 10 of 36 TOPIC 2 - What is convection? The movement of heat in gases and liquids 11 of 36 TOPIC 2 - What is thermal radiation (INFRA RED)? Any hot object will emit thermal radiation in the form of infrared electromagnetic radiation 12 of 36 TOPIC 2 - Density units g/cm3 13 of 36 Pay Back Time Equation Original Cost divided by annual savings 14 of 36 TOPIC 3 - What does a.c. d.c. do? It constantly changes direction 15 of 36 TOPIC 3 - What does d.c. have? A constant direction e.g. cells and batteries 16 of 36 TOPIC 3 - What four electrical safety features are in a home? MCB, RCCB, Fuses (in plugs) and an Earth Wire (Ring Main) 17 of 36 TOPIC 3 - What do fuses and MCB's do? Protect from too much current flowing into something 18 of 36 TOPIC 3 - What does the earth wire do? It takes the current to earth, if perhaps the live wire touched a metal casing on something 19 of 36 TOPIC 3 - What does a RCCB do? It breaks the circuit if the live current it larger than the neutral wires current 20 of 36 TOPIC 5 - Name the 2 types of waves? Longitudinal and transverse 21 of 36 TOPIC 5 - What is a transverse wave? The vibrations of a transverse wave move at a 90 degree angle to the ave direction 22 of 36 TOPIC 5 - What is a longitudinal wave? The vibrations of a longitudinal wave move parallel with the wave direction 23 of 36 TOPIC 5 - How do you find the wavelength? Measure the distance between two wave crests or two wave troughs 24 of 36 TOPIC 5 - How to find the amplitude of a wave? Measure the distance from the middle of the wave to the crest 25 of 36 TOPIC 5 - What is frequency measured in? Hz (Hertz) 26 of 36 TOPIC 5 - What is wavelength measured in? M/S (Metres per second) 27 of 36 TOPIC 5 - Name the wave types of the electromagnetic spectrum? Gamma rays, X Rays, UV, Visible light, IR, Microwaves, Radio Waves 28 of 36 TOPIC 5 - What happens to the wavelength when you go from Gamma Rays to Radio Waves? Wavelength increases 29 of 36 TOPIC 5 - What happens to the frequency of the waves when you go from Radio Waves to Gamma Rays? Frequency increases - Meaning energy also increases 30 of 36 TOPIC 5 - What do all the waves on the electromagnetic spectrum have in common? They all travel at the same speed 31 of 36 TOPIC 5 - What does a Geostationary Orbit do? It orbits once a day and travels at the same speed of earth 32 of 36 TOPIC 5 - What does a Geosynchronus Orbit do? Orbits once every 24 hours, it returns to the same point above earth every 24 hours 33 of 36 TOPIC 5 - Optical Fibres? Uses infrared signal 34 of 36 TOPIC 5 - Satellites? Uses microwave signals 35 of 36 TOPIC 5 - Why use Optical fibres over Satellites? Optical Fibres are slightly faster and they are more secure than satellites 36 of 36
Comments
No comments have yet been made