Questions about the Resistivity poster

What’s on the Resistivity poster?

The rule, 3 worked examples, and the mistake everyone makes. Resistance is proportional to length and inversely proportional to cross-sectional area.; R = ρL/A; Double the length = Double the resistance; Double the diameter = Quarter the resistance; Temperature rise, metal = Resistivity increases; Common mistake: Doubling diameter halves resistance → It quarters it. Semiconductors behave oppositely to metals: resistivity falls with temperature, because more charge carriers are freed.

Who is the Resistivity poster for?

Resistivity belongs to the Physics section rather than to a school year, because physical science is not something one grade owns. Anyone learning electromagnetism can pin it up — a beginner, a student mid-course, or someone revising years later.

When should you use the Resistivity poster?

Resistance depends on the object. Resistivity depends only on the material. A wall chart earns its place by being glanceable from where the work is happening, so Resistivity belongs on the wall where that physical science work actually happens, within glancing distance, rather than filed away.

What other posters go with Resistivity?

AC Circuits, Capacitance and Circuit Basics sit alongside Resistivity in the Physics section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.AC CircuitsCapacitanceCircuit Basics

Is the Resistivity poster free to download and print?

Yes. Resistivity downloads as a free PDF with no account, no email and no watermark, like everything else in the Physics 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 Resistivity poster print at?

Resistivity 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 Resistivity loses nothing.Printing guide