Flashcards
Physics Unit 4 power
Cards in this deck (37)
- 1What is kinetic energy?Energy of an object due to its motion.
- 2What is gravitational potential energy?Energy of an object due to its position.
- 3What is chemical energy?Energy stored in a substance and realised when chemical reactions take place.
- 4What is electrical energy?Energy transferred by an electric current.
- 5What is elastic strain energy?Energy stored in an elastic object when we stretch or squash it.
- 6What is nuclear energy?Energy released when a nucleus of an atom splits or disintegrates.
- 7What is internal energy?Energy of an object due to its internal motion and positions of its molecules.
- 8What is heat energy?Energy transferred from a hot object to a cold object.
- 9What is sound energy?Energy transferred by sound waves.
- 10What is light energy?Energy transferred by light.
- 11Does energy transfer in different forms?Yes.
- 12Can energy be changed from one form into other forms?YES
- 13Energy can be transformed from one form to another or transferred from one place to another. True or false?TRUE
- 14Energy can be created but cannot be destroyed. True or false?FALSE
- 15What does a petrol generator consist of?A petrol engine and an electricity generator.
- 16What are electricity generators in power stations driven by?Turbines.
- 17What is the unit of energy?Joules.
- 18What is efficiency?Efficiency is a measure of how much energy supplied to a device is usefully used.
- 19When does nuclear fission occur?When a uranium nucleus splits as a result of being struck by a neutron.
- 20Is energy released in nuclear fission?Yes
- 21What does neuclear fission mean?when the nucleus of a uranium atom is unstable and can split into in two when a neutron from outside the atom colds with it.
- 22Is energy released in nuclear fusion?yes
- 23What is nuclear fusion?When two nuclei are forced close enough together so they form a single larger nucleus.
- 24What is a wind turbine?Its an electricity generator on top of a tall tower.
- 25What is a wave generator?A floating generator turned by waves.
- 26How are hydro-electricity generators turned?They are turned by water running down hill.
- 27How does a tidal power station work?It traps each high tide and uses it to turn generators.
- 28How can solar energy be converted into energy?Using solar cells or used to heat water directly in solar heating panels.
- 29How is geothermal energy realised?By radio active substances deep inside the earth.
- 30What is the equation for work done?Force X distance
- 31Equation for kinetic energy?1/2 X m X v (squared)
v = speed
m= mass - 32What is the equation for gravitational potential energy?m X g X h
m = mass
g = gravity
h = vertical distance moved - 33What is the unit of power?watt (W)
- 34watt is equal to 1 J/s True or falseTrue
- 35How many watts are in 1 kilowatt?1 kilowatt= 1000 watts
- 36What is the equation for power (in watts)?Energy transferred
_________________
Time taken - 37All types of energy are measured in?WATTS