Unit 5.1–Basics of Energy Flashcards
(17 cards)
Name the seven types of energy.
Sound energy, chemical energy, light energy, thermal energy, kinetic energy, potential energy, electrical energy
When is sound energy given out?
When an object vibrates
Where are chemical energy stored? Name 3 examples and state its function.
Food— help us stay alive, grow and carry out our activities
Fuels— when they are burned, chemical energy stored is released as other forms of energy
Batteries— provide energy for small electrical appliances and other devices
Give 3 examples of fuels
Wood, charcoal and petrol
What does light enable us to do?
To see things
Why do plants need light?
To make food (i.e. photosynthesis)
How do you define whether the object gives out more thermal energy?
The hotter the object, the more thermal energy it gives out.
What objects have kinetic energy?
All moving objects
What is the amount of kinetic energy of an object related to ?
Its speed and mass
How do you define whether the object has more kinetic energy?
Give 2 definitions.
The faster an object moves, the more kinetic energy it has.
The greater the mass of a moving object, the more kinetic energy it has.
When does an object gain potential energy? Give 2 examples.
When it is raised to a high position
When it is stretched or compressed
How do you define whether an object has more potential energy? (1)
The higher the position of the object, the more potential energy it has.
Where is electrical energy supplied from and how does it being transmitted to our homes? Briefly describe the procedure.
Where can electrical energy also be obtained from?
Electrical energy is usually supplied from power stations and then transmitted to our homes along power cables.
It can also be obtained from batteries.
How can we observe the presence of electrical energy in Nature. Give 2 examples and briefly explain.
Lightning carries a huge amount of electrical energy
Electric eels can produce an electric shock when they feel threatened.
Convert 1 joules(J) to 1 kilojoules(kJ)
1 kilojoule = 1000 joules
Where is calorie commonly used?
For measuring the energy value of food
Convert a calorie (cal) to kilocalories (kcal).
1 kilocalories=1000 calories
