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electromagnetism consists of two components of energy called:
electricity and magnetism
each can be used to create the other
How can electricity be generated to power a lightbulb?
something spins the generator
as the magnet inside the generator rotates, it causes electrons/a charge to build up on the coil
electrons want to bond to other atoms to “ground out”
give them a conductor like copper wiring
before it can ground out, we pass it through a lightbulb
inside the lightbulb is a filament often made of a metal that provides resistance, making it harder for electrons to travel through
as electrons push, creating friction, creates heat, gets hot enough that it glows, creating light
then electrons pass through and go to another line, which is the neutral line that takes electricity back to ground out
Electrons will take the path of…
least resistance
Electrolysis
a method of separating ions within a substance by passing electrical current through the substance
separate compounds into positive and negative ions
Electrolysis involves the use of two electrodes called
cathode and anode
anode
positive charge node (attracts negative ions)
cathode
negative charge node (attracts positive ions)
Temperature
the measure of the kinetic energy in a substance’s molecules. Simply put, temperature is atomic motion.
the hotter a substance is…
the faster its atoms move and the further apart they get
unlike temperature, the amount of thermal energy depends on
the quantity of a substance
ie a bathtub at 90 degrees has more thermal energy than a cup of coffee at 120 degrees
Conduction
occurs when heat is transferred due to fast moving atoms and molecules colliding with slower ones in a neighboring region
usually in solids
ie spoon in a bowl of hot soup, you can feel the heat at the spoon handle, molecules bump up through handle
Convection
occurs when cooler portions of a liquid or gas flow in to take the place of hotter, rising portions
usually liquids and gases
ex: in a pot of boiling water, the hot water at the bottom near flame rises up to take the cold waters place, pushing the cold water down, resulting in the churning boiling water
Radiation
occurs when heat is transmitted in the form of electromagnetic waves
high intensity
ie the sun radiating heat and nuclear reactions