1 Energy Flashcards
Name the ten stores of energy.
- Kinetic 🚗
- Thermal 🌡
- Elastic
- Gravitational ⬇️
- Chemical ⚗
- Nuclear ☢️
- Magnetic
- Electrical ⚡
- Light 💡
- Sound 🔊
Law of conservation of energy
Energy cannot be created or destroyed, just transferred from one store to another.
Name the energy stores in a hair dryer. Which of them are useful? (4)
𝗜𝗻 • Electrical 𝗢𝘂𝘁 • Thermal ✔️ • Sound • Kinetic ✔️
Power (2)
- The rate of energy transfer
* The rate of work done
Power equation
power = work done / time J/s = J / s W = J / s
Kinetic energy equation
Ek = ½ * mass * speed² J = ½ * kg * (m/s)²
Gravitational potential energy
Eg = mass * gravitational field strength * change in height J = kg * g * m
Specific heat capacity
The energy required to raise the temperature of 1kg of substance by 1°C.
Specific heat capacity equation
shc = energy / mass * Δtemperature J/kg°C = J / kg * °C
Elastic potential energy
Ee = ½ * spring constant * (extension)² J = ½ * N/m * (m)²
Internal energy
Total kinetic and potential energy of all the particles that make up a system.
Energy can be ___________ usefully, stored or dissipated (______ ___ __ ____________).
1) transferred
2) spread out to surroundings
In a closed system the total energy __, but is transferred from one store to another.
1) never changes
What will happen to energy demand in the future?
It will go up because the population will increase and because of more technology.
Efficiency % equation
(useful output / total input) *100
