Energy (Science)

Energy (Science) (45 Cards)
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	Front cards	Back cards
1	A 2kW device used for 1 hour it uses?	2kWh
2	How can thermal energy be transferred?	Conduction, convection or radiation
3	How do you convert kWh to joules	Convert the time to seconds
4	How do you reduce bills?	Use fewer appliances or more efficient ones and insulated lose less thermal energy
5	How many seconds are there in an hour?	3600 seconds For example 2kWh=2,000J/s x 3,600s=7,200,000J
6	How much energy do you need for running?	60kJ per minute
7	How much energy do you need for sitting?	6kJ per minute
8	How you can you transfer energy?	By using a force which is doing work
9	If a 2kW device is used for 2 hrs it uses?	4kWh
10	Infrared radiation transfers energy without..	Particles- it is a wave
11	Light, sound and electricity are ways of..	Transferring energy between different stores.
12	What are coal, oil and gas used for?	To run thermal power stations
13	What are examples of renewable resources?	Wind, tidal, wave, hydroelectric, geothermal, biomass and solar powers.
14	What are fossil fuels burned for?	Heat water which produces steam.
15	What can radiation be?	Restored or reflected
16	What do all objects do?	Emit radiation
17	What do burning fossils produce?	Greenhouse gases such as carbon dioxide
18	What do non renewable resources include?	Fossil fuels such as coal, oil and gas they were formed millions of years of years ago from fossilised remains.
19	What do renewable resources produce?	Greenhouse gases when built, not when used and will not run.
20	What do thermometers measure?	The temperature in degrees Celsius.
21	What do vibrating particles occur in?	Solids
22	What do you need different amounts of energy for?	For different activities.
23	What does convection occur in?	Solids and Liquids
24	What does heating an object depend on?	The mass, material and temperature rise affects the energy you need to heat an object.
25	What does it mean if something is non renewable?	You cannot reuse them and they will eventually run out
26	What does temperature measure?	The average energy
27	What does the amount of radiation depend on?	Their temperature and the surface (colour and rough/smooth)
28	What does the law of conservation of energy state?	Energy cannot be created or destroyed just transferred.
29	What does the power rating tell you?	How much energy is transferred per second or the rate of transfer energy.
30	What does the steam from the fossil fuels do?	It turns a turbine
31	What does thermal energy measure?	The total energy
32	What happens when particles vibrate?	They collide into others
33	What happens when we heat things?	The particles gain more kinetic energy and vibrate more or faster.
34	What is Energy measured?	Joules (J)
35	What is energy use measured in?	Kilowatt hours (kWh)
36	What is equilibrium?	When objects have the same thermal energy
37	What is power?	The rate of energy transfer- how much energy is transferred per second
38	What is the amount of energy in an apple?	200kJ per 100g
39	What is the amount of energy in chips?	1000kJ per 100g
40	What is the current from turbines sent to?	Our offices, factories and houses down long cables.
41	What is the formula for Work done(J)?	Work done(J)= force (N) x distance (m)
42	What is the rate of transfer energy measured in?	Watts (W)
43	What makes it easier to do work?	Simple machines like levers and gears, but you still get the nervy out that you put in
44	What total energy before =?	Total energy after
45	Where is their energy?	In the chemical stores associated with food and fuel