# Difference between revisions of "Ohm's Law"

(added initial info, internal links) |
|||

Line 2: | Line 2: | ||

==What is it?== | ==What is it?== | ||

+ | |||

+ | Ohm's Law is named after Georg Ohm, a German physicist who postulated it in 1827. His treatise described measurements of voltage and current in simple circuits, using various lengths of wire as resistors. The following diagram shows a voltage source V passing through a resistor R creating a current I | ||

+ | |||

+ | [[Image:Ohms_law_voltage_source.svg.png | 120px ]] | ||

+ | |||

+ | The following diagram shows a current source I through a resistor R, causing a potential drip (voltage V) | ||

+ | |||

+ | [[Image:Ohmslawcurrentsource.png |165px]] | ||

Ohm's Law states that the current that passes between two points on a conductor is directly proportional to the [[Voltage | potential difference]] (voltage) between the points and inversely proportional to the to the [[Resistors |resistance]] of the conductor between the points. | Ohm's Law states that the current that passes between two points on a conductor is directly proportional to the [[Voltage | potential difference]] (voltage) between the points and inversely proportional to the to the [[Resistors |resistance]] of the conductor between the points. |

## Latest revision as of 02:29, 30 April 2009

Related wiki pages : Electronic Theory, Voltage, Current, Impedance, Resistors

## What is it?

Ohm's Law is named after Georg Ohm, a German physicist who postulated it in 1827. His treatise described measurements of voltage and current in simple circuits, using various lengths of wire as resistors. The following diagram shows a voltage source V passing through a resistor R creating a current I

The following diagram shows a current source I through a resistor R, causing a potential drip (voltage V)

Ohm's Law states that the current that passes between two points on a conductor is directly proportional to the potential difference (voltage) between the points and inversely proportional to the to the resistance of the conductor between the points.

so, <math>I = \frac{V}{R}</math>

where

- "I" is the current in amperes,
- "V" is the potential difference between the ends of the resistor in volts, and
- "R" is the resistance of the resistor, measured in ohms

Ohms Law can also be used in impedance (resistance to AC) calculations thus:

<math>I = \frac{V}{Z}</math>

where

- "I" is the current in amperes,
- "V" is the potential difference between the ends of the resistor in volts, and
- "Z" is the Impedance (AC resistance) of the resistor, measured in ohms

Electronic Theory
| |

Physical quantities | Current * Gain * Impedance * Power * Q of a circuit * Radiated Power Measurement * Reactance* Resistivity * Resonance * Voltage |

Components | Baluns * Bipolar-Junction Transistors * Capacitors * Diodes * Inductors* Lasers * Microphones * Resistors * Transformers * Wire |

Circuits | Attenuators * Digital Signal Processing (DSP) * Dummy load * Filters * LC filters * Power Supply Design * Rectifier Circuits |

Design | Amplifier Design * Oscillator Design |

Electromagnetic Waves | Relative power (Decibels) * Harmonics * Interference and BPL |