Joule's Law & Resistive Power

Reference Card

001

Version

03

Series

Toptronic College

Topics

Joule's Law, Resistive Power

Authored by

Jacques Botte for toptronic college www.toptronic.com www.toptroniccollege.org

Verso

Recto

Elasticsearch endpoint returned with "No alive nodes found in your cluster" .

Power, the rate of doing work, is equal to the voltage multiplied by current.

$P=V(volts)\times I(amperes)$

The Unit of electrical Power is called the watt.

One watt is equal to 1 volt multiplied by 1 ampere.

The Power (P), 1 watt is also one joule per second or the Energy (W) per unit of Time (s).

The JouIe is the Energy Dissipated as Heat.

By substituting the Ohm’s Law equivalent for V and I, the new formulas are obtained as shown below.

If you know the voltage and the resistance

$P(watts)={\Biggl (}{\biggl (}{\bigl (}V(volts){\bigr )}\times {\bigl (}V(volts){\bigr )}{\Bigr )}/{\bigl (}R(ohms){\bigr )}{\Biggr )}$

if you know the resistance and the current

In a Resistance, Electrical Power is turned into heat.

The higher the power, the faster the heat is generated.

Cool them if needed!!! Joule’s Law is shown below.