What’s on the Poynting Vector poster
The rule, 3 worked examples, and the mistake everyone makes.
- The Poynting vector gives the direction and the density of electromagnetic power flow.
- S = E × H · S_avg = |E|²/(2η)
- 1 V/m in free space = 1.33 mW/m²
- Direction of S = E crossed into H
- Into a conductor = S points inward
- Common mistake: Reading S as the energy stored in the field → S is a flow, in watts p…
Power in a coaxial cable travels through the dielectric between the conductors, not inside the copper. The copper only guides it.
Questions about the Poynting Vector poster
- What’s on the Poynting Vector poster?
- The rule, 3 worked examples, and the mistake everyone makes. The Poynting vector gives the direction and the density of electromagnetic power flow.; S = E × H · S_avg = |E|²/(2η); 1 V/m in free space = 1.33 mW/m²; Direction of S = E crossed into H; Into a conductor = S points inward; Common mistake: Reading S as the energy stored in the field → S is a flow, in watts p…. Power in a coaxial cable travels through the dielectric between the conductors, not inside the copper. The copper only guides it.
- Who is the Poynting Vector poster for?
- Poynting Vector belongs to the Electrical Engineering section rather than to a school year, because engineering is not something one grade owns. Anyone learning electromagnetics can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the Poynting Vector poster?
- Use it to turn a field strength into a power density, or to see where energy enters a load. A wall chart earns its place by being glanceable from where the work is happening, so Poynting Vector belongs on the wall where that engineering work actually happens, within glancing distance, rather than filed away.
- What other posters go with Poynting Vector?
- Plane Waves, Antenna Fundamentals and Antenna Types sit alongside Poynting Vector 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.Plane WavesAntenna FundamentalsAntenna Types
- Is the Poynting Vector poster free to download and print?
- Yes. Poynting Vector 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 Poynting Vector poster print at?
- Poynting Vector 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 Poynting Vector loses nothing.Printing guide
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