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P1 GCSE
gcse unit 1 AQA
Question | Answer |
---|---|
specific heat capacity formula | E= M x C x O |
specific heat capacity formula: E | energy transfer (j) |
specific heat capacity formula: C | specific heat capacity (J/Kg*C) |
specific heat capacity formula: O | temperature change (*C) |
specific heat capacity formula: M | Mass (kg) |
Calculating speed of wave | Speed[m/s] = frequency[Hz] x wavelength[m] |
Renewable energy resources | Wind. Wave. tides. HEP. Solar. Geothermal. Food. Biofuels |
Non-renewable energy resources | Coal. Natural Gas. Oil. Nuclear fuels |
Transverse wave eg. | Light. EM waves Ripples in the water |
longitudinal wave eg. | Sound. Ultrasound. Shock waves |
Calculating payback time | Payback time = Initial cost / annual saving |
Factors affecting the rate of condesation | |
U-values? | Measures how effective a material is as an insulator. higher the number-worse the insulator |
convection? | occurs when the move energetic particles move from the hotter region to the cooler region-and take their heat energy with them. |
conduction? | the process where vibrating particles pass on their extra kinetic energy to neighbouring particles |
conduction is faster in.. | denser solids because particles are closer together and collide more often. |
Evaporation? | Particles escape from a liquid's surface. can take place melting p-boiling p. higher KE = higher chance to escape,leaving low KE = cooling effect. |
condensation? | Gas cools/slow down/ lose KE. the attractive fores between particles pull them closer together. |
Energy forms | Light. heat. chemical. kinetic. electrical. elastic. gravitational potential. nuclear. sound. |
calculating efficiency | efficency = useful energy out/ total energy in |
dissipated | the energy is spread out and lost. |
When heating a substance.. | you give the particles more kinetic energy. |
Solid particle structure | Strong forces of attractions. close together in fixed,regular arrangement. Vibrate. low kinetic energy |
liquid particle structure | weak forces of attraction. particles close together. form irregular arrangements. move at slow speeds. |
Gas particle structure | most kinetic energy. move @ high speeds. almost no forces of attraction between particles. |
useful energy | energy is only useful when it can be converted from one form to another. |
Dark, Matt surfaces.. | good absorbers, good emitters of infrared radiation |
Light, shiny surfaces.. | are poor absorbers and poor emitters of infrared radiation and good reflectors. |
low amplitude = | Quieter sound |
low number of waves = | lower frequency |
higher amplitude = | louder sound |
higher number of waves = | higher frequency |
thermal radiation? | is energy transfer by electromagnetic waves |
Mnemonics for Energy types | GEEKS LUNCH |