Energy Flashcards
What are the types of active energy?
- kinetic
- light
- sound
- heat
- electric
What are the types of potential energy?
- elastic
- chemical
- gravitational
- nuclear
How do you measure the efficiency?
useful energy /total energy x 100.
How do you find the percentage of something?
You divide the value by the total value and then multiply the result by 100.
How do you measure chemical energy?
It can be measured by burning/combusting the chemical and using the energy to heat water.
how do you calculate the chemical energy?
q=mc(triangle)T
energy=mass of water x 4.18 x change in temp.
What is the definition of energy?
The TOTAL movement of particles in a substance (joules). Depends on the type, and no. of particles.
What is the definition of temperature?
The AVRAGE movement of particles (°C). Does NOT depend on no. of particles.
What is the definition of diffusion?
the random movement of particles that causes them to spread out and mix. Diffusion does NOT stop when the particles are spread out.
What is diffusion affected by?
If the particles are smaller diffusion happens faster. If the temp. increases than particles also diffuse faster because they gain energy.
What is the definition of Insulation?
Insulation is any method used to stop the movement of heat energy. Th type of method depends on the heat transfer involved.
How do you prevent conduction (insulation) ?
Use materials like wood/plastic which interrupt conduction. Place objects in vacuum.
How do you prevent convection (insulation) ?
It is difficult to stop particles from moving. Place barriers within liquid/gas.
How do you prevent radiation (insulation) ?
use lighter colored objects to reduce emission.
