Concept 2: Opposite charges attract each other, and like charges repel each other.
Laws of Electric Charge
1) like charges __________________
2) opposite charges ________________
3) neutral objects are _________________ to charged objects
Concept 3: Chemical energy separates electric charges in cells
Battery- A combination of __________________________________________________________________
Electrochemical Cells- ____________________________________________
Commonly called cells or batteries. Chemical reactions of two different metals
Terminal-the _______________________________________ ends of a battery
-one end has extra _____________________________
and the other end has
__________________________________________________
Energy -Ability to do work
Work- Work is done on an object when a force acts on it and _____________________________________.
Kinetic Energy- Energy __________________________________________
Potential Energy -Energy __________________________________
Example: Stretching a spring and hold it, the energy is stored.
Electric Potential Energy -Energy stored in a battery
Example: Batteries use electrons to store energy to be used later
Understanding how a cell works:
Because opposite charges attract each other, it takes energy to separate positive and negative
charges. In a electrochemical cell, chemical reactions provide this energy, thus separating charges.
Because work went into separating charges, electrons now have the energy to do other work, such
as running a fan or a watch. The electrical energy now stored in the cell is a form of potential energy.
It has the potential to do work because of the separation or position of the charges.