NS Question Cards Flashcards
Define energy?
energy is the ability to work, bring about change or transfer energy to something else
Explain energy?
Matter is made up of atoms, atoms are continually vibrating, this vibration creates electricity
Name the 3 different types of potential energy?
- Chemical potential energy
- Elastic potential energy
- Gravitational potential energy
What is a renewable resource?
A resource that can be replenished over a short period of time
What is a non-renewable resource?
A resource that cannot be replenished over a short period of time
What does the law of conservation state?
That energy cannot be created nor destroyed. It can only be transferred into something else
What % of useful energy output does an appliance have to have to be energy efficient?
50% or above
What is a energy system?
A system consisting of different parts that work together, use or give out energy
What are the different types of systems?
- Mechanical system
- Electrical system
- Thermal system
- Biological system
What do the different types of systems need to work?
- Mechanical system - force and movement
- Electrical system - electrical charges
- Thermal system - particles move faster
- Biological system - energy from the Sun
What are the types of heat transfer?
- Convection
- Conduction
- Radiation
What is the main premise of heat transfer?
The hotter atoms bump into the colder atoms
What is energy measured in
kJ (joules)
