Ohm's Law

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Ohm's Law defines the relationships between (P) power, (E) voltage, (I) current, and (R) resistance. One ohm is the resistance value through which one volt will maintain a current of one ampere.

Current

( I ) Current is what flows on a wire or conductor like water flowing down a river. Current flows from negative to positive on the surface of a conductor. Current is measured in (A) amperes or amps.

Voltage

( 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.

Resistance

( 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.

Power

( P ) Power is the amount of current times the voltage level at a given point measured in wattage or watts.

Ohm's Law:
• Ohm's Law Pie Chart
• Ohm's Law Calculators and Formulas

Mobile Electronics Basics:
• Diodes
• Glossary of Terms and Definitions
• Ohm's Law
• Recommended Books & DVD's
• Recommended Wire Sizes
• Relays
• Resistors
• Tools and Equipment

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