Gamtronics

What is Voltage and Current?


What is Voltage?

Simply it is what's needed for electrons to flow from one point to another.  Lets say an electronic circuit has endpoints A and B, if there is no potential difference between the two endpoints no current will flow, but if there were even a slight difference in potential between the two, current will flow.  No potential (voltage) difference, no current flow.  Voltage is the incentive for electrons to flow.  Potential difference is also referred to as electromotive force or electrical pressure.    The more involved definition of  potential difference is defined as the amount of work per charge needed to move a electric charge from the second point to the the first or the amount of work that unit charge flowing from the first point to the second can preform.  Potential difference is measured in volts.  A Volt is equal to one joule of energy/per coulomb of charge.  One volt will drive one coulomb (6.24 x 1018) electrons through a resistance of one ohm in one second.  There are two types of voltage: Alternating and Direct.   Alternating voltage is used in our homes to power our TV's, DVD's Computers and appliances. Direct comes from batteries which normally powers our portable devices such as MP3 players, cell phones and ipads.



What is Current?

Current is the amount of electric charge (electrons) flowing past a specified circuit point per unit time.  Current is measured in amperes or amps for short, around 6.241 × 1018 electrons passing a given point each second constitutes one ampere.  There are two types of current:
Alternating (AC) and Direct (DC).  To give you an idea of how much power an amp is:


A TV normally draws about 2-3 amps AC,
A DVD player draws about 1/3 to 1 amp AC,
A Desktop Computer normally draws about 2-5 amps AC,
A Vacuum cleaner draws about 10-12 amps AC,
A portable MP3 player draws about 1/20 to 1/10 of an amp DC,
A Car Stereo draws about 1/2-2 amps DC,
A Car Stereo Power Amplifier draws about 10-20 amps DC.

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