Energy Flashcards
(23 cards)
How much energy does an Apple have?
150 KJ ***??
How much energy in 10 potato crisps?
2225 KJ
What are Macronutrients?
nutrients required in large amounts
- carbohydrates
- fats
- proteins
What are Micronutrients?
nutrients only required in small amounts
- minerals
- vitamins
What does fibre do?
Cleans intestines
**check
What does water do?
Keeps the body hydrated
What do carbohydrates do?
provide an energy source that is quickly converted
What are fats?
a concentrated energy source stored by the body for long term energy supplies and warmth
What do proteins do?
builds, repairs and renews body tissues
What do minerals do?
provide essential simple chemicals
What do vitamins do?
carry out specific bodily processes
What happens when the energy in (consumed) is less than the energy out (used)?
- tiredness
- stunted growth
- weight loss
- bone fragility
- susceptible to illness
What happens when the energy in (consumed) is equal to the energy out (used)?
- balanced diet
- sensible exercise
- healthy!
What happens when the energy in (consumed) is greater than the energy out (used)?
- tiredness (extra weight)
- heart problems
- obesity
Why do we need food?
We use the energy obtained from food to fuel our bodies for growth, repair and movement. How much energy we need is determined by our gender, age and activity level.
Define conduction
Conduction occurs when particles collide with each other and transfer heat energy.
Define convection
Convection is the movement of particles from an area of higher temperature to an area of lower temperature. As particles gain energy, they become less dense and rise.
Define radiation
Transfer by radiation involves energy travelling as waves from one place to another without using matter
Insulator
a substance that prevents or slows the transfer of heat energy
Active energy
Energy in motion
Potential energy
stored energy that is not in motion
What is a fossil fuel
a source of energy where there is a finite supply, e.g coal.
What is a renewable energy source
an energy source that replaces itself faster than it gets used up
