AC Power TriangleReal, reactive and apparent power as one right triangle, cosine the power factor.Electrical EngineeringApparent power is the vector sum of real power andreactive power, ninety degrees apart.S = VI · P = S cos φ · Q = S sin φ10 kVA at pf 0.8P = 8 kWS cos φ.The same loadQ = 6 kvarS sin φ.pf 0.8 raised to 0.95Current falls 16%Same real power.THE COMMON MISTAKEAdding kW and kvar arithmeticallyAdding them as perpendicular vectorsReal and reactive power are ninety degrees apart, so 8 kW with 6 kvar is 10 kVA,not 14 kVA.Educational reference. Correcting power factor in a real installation isdesign work governed by local electrical regulations.AC Power Trianglelearnposters.com
AC Power Triangle — printable engineering wall chart from LearnPosters. Free vector PDF, US Letter and A4.

What’s on the AC Power Triangle poster

The rule, 3 worked examples, and the mistake everyone makes.

Educational reference. Correcting power factor in a real installation is design work governed by local electrical regulations.

Questions about the AC Power Triangle poster

What’s on the AC Power Triangle poster?
The rule, 3 worked examples, and the mistake everyone makes. Apparent power is the vector sum of real power and reactive power, ninety degrees apart.; S = VI · P = S cos φ · Q = S sin φ; 10 kVA at pf 0.8 = P = 8 kW; The same load = Q = 6 kvar; pf 0.8 raised to 0.95 = Current falls 16%; Common mistake: Adding kW and kvar arithmetically → Adding them as perpendicular vectors. Educational reference. Correcting power factor in a real installation is design work governed by local electrical regulations.
Who is the AC Power Triangle poster for?
AC Power Triangle belongs to the Electrical Engineering section rather than to a school year, because engineering is not something one grade owns. Anyone learning circuit analysis can pin it up — a beginner, a student mid-course, or someone revising years later.
When should you use the AC Power Triangle poster?
Use it to see why a low power factor raises current without delivering more work. A wall chart earns its place by being glanceable from where the work is happening, so AC Power Triangle belongs on the wall where that engineering work actually happens, within glancing distance, rather than filed away.
What other posters go with AC Power Triangle?
Divider Rules, Capacitor & Inductor Laws and Ohm's Law & Power sit alongside AC Power Triangle in the Electrical Engineering section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Divider RulesCapacitor & Inductor LawsOhm's Law & Power
Is the AC Power Triangle poster free to download and print?
Yes. AC Power Triangle downloads as a free PDF with no account, no email and no watermark, like everything else in the Electrical Engineering section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
What size does the AC Power Triangle poster print at?
AC Power Triangle is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of AC Power Triangle loses nothing.Printing guide

Related posters

Charts that sit alongside AC Power Triangle on the same wall.

Browse every Electrical Engineering poster, or start from the full catalogue.