Flashcards
Physics 4 Generating Electricity GCSE Core
Flashcards do conjunto (17)
- 1What is the national grid?A network of cables and transformers used to distribute electricity
- 2What are step-up transformers?They increase the voltage and lower the current, so less heat is lost making the system more efficient
- 3What are step-down transformers?They decrease the voltage , so it is more safe to use in buildings.
- 4What are 4 disadvantages of underground cables?Expensive ⟶ difficult to install ⟶ difficult to repair ⟶ closer to humans
- 5What do waves transfer?Energy and information
- 6What are transverse waves?Transverse waves vibrate perpendicular to direction of energy transfer. All electromagnetic waves are transverse
- 7What are longitudinal waves?Longitudinal waves vibrate parallel to direction of energy transfer. Sound waves are longitudinal
- 8What is the amplitude?The Height of the waves from the middle (rest) to the top (peak)
- 9What is the frequency (Hertz,HZ)The number of waves passing in one second
- 10What is the Wavelength?The distance from one wave peak to the next
- 11What is a plain mirror?A flat mirror
- 12What is the normal?A dashed line drawn perpendicular to the mirror
- 13What is a Virtual image?It is a image formed from virtual rays and CANNOT be projected onto a screen
- 14What is the angle of incidence?The angle of reflection
- 15How do you draw reflection in 3 steps?1. Draw the image same distance from the mirror ⟶ 2. Draw straight lines (virtual and real) from image to eye ⟶ 3. Draw reflected rays the to object
- 16What is refraction?When waves change direction (bend) as they cross a boundary
- 17Why does refraction happen?Because the waves change speed in each substance
Informações
- Descrição
- GCSE Physics FlashCards sobre Physics 4 Generating Electricity GCSE Core, criado por Chloe Roberts em 30-04-2014.
- Criado por
- Chloe Roberts · abr 2014
- Atualizado
- 19 fev 2016
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