🔋 Energy Flashcards
(10 cards)
State the law of conservation of energy.
Energy cannot be created or destroyed, only transferred or transformed.
What is the formula for kinetic energy?
KE = ½ × mass × velocity².
What is the formula for gravitational potential energy?
GPE = mass × gravitational field strength × height.
Define power in terms of energy transfer.
Power is the rate at which energy is transferred or work is done; Power = Energy transferred / Time.
How is efficiency calculated?
Efficiency = (Useful energy output / Total energy input) × 100
What are some ways to improve energy efficiency in homes?
Insulation, double glazing, energy-efficient appliances, and LED lighting.
What is thermal conductivity?
A measure of how well a material conducts heat; materials with low thermal conductivity are good insulators.
What is specific heat capacity?
The amount of energy required to raise the temperature of 1 kg of a substance by 1°C.
How do non-renewable and renewable energy sources differ?
Non-renewable sources (e.g., coal, oil) will eventually run out; renewable sources (e.g., solar, wind) are replenished naturally.
What are some environmental impacts of energy production?
Air pollution, greenhouse gas emissions, habitat destruction, and thermal pollution.
