Energy Flashcards
what is specific heat capacity?
What is latent heat?
The energy required to raise the temperature of 1kg of a substance by 1°C.
The energy required for a substance to change state - but not temperature.
What are the energy stores?
Hint: Kinky Grannies Eventually Throw Cheating Men Elephant Nappies.
Kinetic
Gravitational potential energy
Elastic
Thermal
Chemical
Magnetic
Electrostatic
Nuclear
Energy can only ____1____ into different energy stores.
Energy is never __2__ up, only _____3_____.
Complete the statements.
- Dissipate
- Used
- transferred
what are the starting energy store; the final energy store and the method for the following situations?:
- A ball hit in the air by you
- A car hitting a wall
- Boiling water in a kettle
- Kinetic, Elastic - mechanical method
- Kinetic, Elastic - Mechanical method
- Electrostatic, Thermal - Electrical method
- A graph
- A visual picture of where energy is going
- The size of arrows illustrate how much is going there
What type of diagram is being described?
A sankey diagram
What does it mean when talking about an efficient device?
An efficient device is when there is little to no energy wast, whether that be through heat or something else.
NOTHING is 100% efficient.
Give a definition for the following:
- Conduction
- Convection
- Radiation
- The more heat, the more it vibrates - Friction = heat
- Heat hits particles at the bottom of the beaker first, they rise to the top and cool, causing it to sink to the bottom
- Stand in front of something and you can feel the heat - electromagnetic spectrum. EG) fire/halogen heater
what are three factors effecting heat transfer?
- Bigger temperature difference
- Larger surface area
- Larger volume
Name ONE good insulator
Air
Payback time equation
cost of installation (£) / Savings per year in fuel costs (£)
If the payback time is too long, the energy-saving solution is not cost-effective
None renewable energy stores - advantages - disadvantages
Coal -cheap to mine -CO2
Oil - short start up time -CO2
Gas - slightly cleaner fuel - CO2
Nuclear -No CO2 produced and creates a lot of energy - dangerous nuclear waste
Renewable energy stores - advantages - disadvantages
Wind - No fuel cost - Not always wind and noisy
Hydroelectric - No fuel cost - can flood and disrupts habitats
Solar - No fuel cost - expense,no sun at night/not always sun
Geothermal - No fuel cost - only available in volcanic regions
Vacuum thermal flask (exams favourites):
1. Plastic stopper
2. Material type
3. Vacuum air filled gap
4. Surface type
- Plastic stopper - poor conductor - reduces convection
- Glass/ Plastic - poor conductors
- Vacuum gap - NO conduction, NO convection
- Silvered surface - reduces radiation - poor emmitor good reflector.
traditional power station method.
- fossil fuel is burnt
- heat turns water into steam
- steam turns a turbine
- turbine turns a generator
- induces currents and generates electricity.
What is the domestic voltage ?
What is the starting voltage?
230V
3,000V
