Convection conduction and radiation. Heat Transfer Conduction, Convection and Radiation.
Explain how energy is transferred by conduction, convection and radiation.
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D3 - Describe energy transformations among heat, light, electricity and motion. D5 - Explain how electricity is used to produce heat and light in incandescent bulbs and heating elements.
Transcript of Explain how energy is transferred by conduction, convection and radiation.
Energy
Explain how energy is transferred by conduction, convection and radiation.
D2
D3 - Describe energy transformations among heat, light, electricity and motion.
D5 - Explain how electricity is used to produce heat and light in incandescent bulbs and heating elements.
D3/D5
Define “energy.”Energy is defined as the ability to do work.Work is an activity involving a force and movement in the direction of the force
Warming up …
There are five categories of energy.
The five main forms of energy are:1. Mechanical2. Nuclear3. Chemical4. Electromagneti
c5. Heat
Mechanical◦ This is energy of motion that is used to
perform work
Subclasses of Energy
Nuclear Energy
The nucleus of an atom is the
source of nuclear energy.
Fission:When the nucleus splits, nuclear energy
is released in the form of heat energy and light energy.
Fusion:When nuclei collide at high speeds and
join, releasing energy.
Nuclear Energy
Nuclear Energy
The sun’s energy is produced from a nuclear fusion
reaction in which hydrogen nuclei
fuse to form helium nuclei.
Nuclear Energy
The nuclear energy produces energy through nuclear
fission.
Chemical Energy◦This is energy stored in the chemical bonds of
molecules. ◦This can be released when these bonds are broken.◦For example, the food we eat contains chemical
energy, as does the fuel for a fire
Chemical energy can be transferred to the surroundings as heat, light, motion and sound when that energy is released
Electromagnetic Energy◦This is energy of an electric or magnetic field.
◦Remember the attraction and repulsion due to magnets and electricity?
Electromagnetic Energy Power lines carry electromagnetic
energy into your home in the form of electricity.
What is the definition of “electricity?”
Electromagnetic Energy Light is a form of
electromagnetic energy.
Each color of visible light (Roy G Biv) represents a different amount of electromagnetic energy.
Electromagnetic Energy is also carried by X-rays, radio waves, and laser light.
A form of energy associated with the motion of atoms or molecules.
Heat is capable of being transmitted from one substance to another.
Definition of Heat
Heat Energy is transferred by a difference in temperature.
You can experience hypothermia even in warm water, if you are in there long enough!
Temperature and heat are NOT THE SAME.
Temperature and Heat
This measures the average amount of kinetic energy of the particles of the substance.
An increase in temperature is an increase in the kinetic energy of the particles.
“How hot or cold is it?”
Measured in degrees Celsius.
Temperature
The amount of energy, measured in joules (J).
Heat
Heat, when added to a substance, can either change its temperature, or change its phase.
A swimming pool at 30°C is at a lower temperature than a cup of tea at 80°C.
BUTthe swimming pool contains more water, so it stores more thermal energy or heat.
The large beaker contains more water and needs more thermal energy or heat to reach 100°C.
The small beaker of water boils first
