## Ohm’s Law 101

Through experiments circa 1828, George Simon Ohm determined that the amount of current, symbol is *I*, in a circuit depends on its resistance, symbol is *R* , and the line voltage *V*.

Hence Ohm’s Law states, *I = V/R*

If any two of the variables I, V, R are known, the third can be calculated.

Note that a low voltage value with a low resistance level will produce a large current flow. And with a high voltage value, the current flow can be low if there is a large level of resistance in the circuit.

The three forms of Ohm’s law are *I = V/R; V = I x R; R = V/I *

Additionally, according to Ohm’s Law, the amount of power consumed in a circuit is the product of current and voltage.

*P = V x I*

Similarly, if any two of the variables P, I, V are known, the third can be calculated.

**These relationships apply to both alternating and direct current:**

One ampere is the current flow produced by one volt of potential difference across one ohm of resistance level.

Practical Units of Electricity |
|||||

Coulomb | Ampere | Volt | Watt | Ohm | Siemens |

6.25 x 10^{18 }electrons |
Coulomb / second | Joule / coulomb | Joule / second | Volt / Amepere | Ampere / volt |

Units of measurement: I - amperes (amps), V - volts, R - ohms, P - watts

Basic Unit Prefixes | ||

Prefix | Symbol | Power of |

micro | µ | 0.000,001 = 1 x 10^{-6} |

milli | m | 1,000 = 1 x 10^{-3} |

kilo | k | 1,000 = 1 x 10^{3} |

mega | M | 1,000,000 = 1 x 10^{6} |

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