Physics Practice 0.0 / 5 ? PhysicsAllGCSEAQA Created by: ECreated on: 09-11-20 16:36 System An object ot group of Objects 1 of 17 What can happen to energy? Transferred, Dissipated, Stored 2 of 17 Efficienty eqn Useful / Total 3 of 17 Closed System System where energy does not eneter or leave. 4 of 17 Reliable Does not depend on uncontrollable factors (such as weather) 5 of 17 For RP2 the independant variable is... Insulator or number of layers 6 of 17 Potential difference Deffinition Work done per unit charge 7 of 17 Current deffinition Rate of flow of charge 8 of 17 What causes Resistance? The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance. 9 of 17 For themistors, as temperature increases, resistance Decreases 10 of 17 For LDRs, as light intensity increases, resistance Decreases 11 of 17 Explain Step up Transformers Increases Voltage, which decreases curent, meaning less energy is lost as heat. 12 of 17 Step Down Transfromers... Decrease voltage to safe levels, this increases the current increasing energy loss as heat. 13 of 17 Why can a solid not be compressed? As the molecules are already very closely packed due to the strong intermolecular forces. 14 of 17 Internal energy = Kinetic plus potential energy of all the particles in a system. 15 of 17 Specific latent heat deffinition Is the amount of energy required to change the state of 1 kilogram (kg) of a material without changing its temperature. Fusion / Vaporisation. 16 of 17 Gasses are in Constant random motion 17 of 17
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