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Physics
Section 4 (Energy Resources and Energy Transfer)
Question | Answer |
---|---|
Name the 8 energy stores | 1. Kinetic 2. Thermal 3. Chemical 4. Gravitational Potential 5. Elastic Potential 6. Electrostatic 7. Magnetic 8. Nuclear |
What 4 ways can energy be transferred | 1. Mechanically 2. Electrically 3. By heating 4. By radiation |
What is the Principle of Conservation of Energy | Energy can be stored, transferred between stores, and dissipated - but it can never be created or destroyed. The total energy of a closed system has no net change |
What is the equation for efficiency? | Efficiency = useful energy output/total energy output x 100 |
What are the 3 methods of transferring energy by heating? | 1. Conduction 2. Convection 3. Radiation |
What is thermal conduciton? | The process where vibrating particles transfer energy from their kinetic energy store to the kinetic energy stores of neighbouring particles |
When does convection occur? | When the more energetic particles move from the hotter region to the cooler region - and transfer energy as they do |
Convection currents are all about change in ____________ | density |
Define power | The rate at which energy is transferred |
What is the formula for power? | Power = Work done/time taken (P = W/t) |