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2.0 General Questions
•( I ) Current is what flows in a wire or conductor like water flowing through a pipe. Current is measured in (A) amperes or amps.
•( E ) Voltage is the difference in electrical potential between two points in a circuit. It's the push or pressure behind current flow through a circuit, and is measured in (V) volts.
•( R ) Resistance determines how much current will flow through a component. Resistors are used to control voltage and current levels. A very high resistance allows a small amount of current to flow. A very low resistance allows a large amount of current to flow. Resistance is measured in ohms.
•( P ) Power is the amount of current times the voltage level at a given point measured in wattage or watts.
The relationships of Current, Voltage, Resistance, and Power are given here:
A great example provided by Jason can be found Here
You can find many other useful calculators at 101Science.com
suggested a demo download from Orcad that allows you to run their software to do layouts and analysis.
Xtronics and another from Samengstrom.com.
DannyG.com offers a nice little calculator to find Resistor Values from color codes.
Resistor Color Codes are also being discussed Here.
Printed Circuit Board Fabricators .