Knowledge Base Types Of Power What is Active Power? Article sections Active power (P) is a measurement which expresses the ability of a system to perform a given amount of work. Last Updated: 4 years ago in Types Of Power Related Articles What is the difference between Power Factor and Displaced Power Factor? What is Apparent Power? Why do Industrial users need to measure reactive power? Do domestic installations need to measure Reactive Power? Why do I need to measure Reactive Power? What is Reactive Power and Nonactive Power?