What’s on the Capacitance poster
The rule, 3 worked examples, and the mistake everyone makes.
- Capacitance is charge stored per unit potential difference.
- C = Q/V · E = ½QV = ½CV² · τ = RC
- Series capacitors = 1/C = 1/C₁ + 1/C₂
- Parallel capacitors = C = C₁ + C₂
- Time constant = τ = RC
- Common mistake: Using E = QV for stored energy → E = ½QV
After 5 time constants a capacitor is over 99% charged. That is the practical rule for circuit design.
Questions about the Capacitance poster
- What’s on the Capacitance poster?
- The rule, 3 worked examples, and the mistake everyone makes. Capacitance is charge stored per unit potential difference.; C = Q/V · E = ½QV = ½CV² · τ = RC; Series capacitors = 1/C = 1/C₁ + 1/C₂; Parallel capacitors = C = C₁ + C₂; Time constant = τ = RC; Common mistake: Using E = QV for stored energy → E = ½QV. After 5 time constants a capacitor is over 99% charged. That is the practical rule for circuit design.
- Who is the Capacitance poster for?
- Capacitance 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 Capacitance poster?
- Capacitors store charge and energy. The energy is half QV, not QV. A wall chart earns its place by being glanceable from where the work is happening, so Capacitance belongs on the wall where that physical science work actually happens, within glancing distance, rather than filed away.
- What other posters go with Capacitance?
- AC Circuits, Circuit Basics and Electric Fields sit alongside Capacitance 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 CircuitsCircuit BasicsElectric Fields
- Is the Capacitance poster free to download and print?
- Yes. Capacitance 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 Capacitance poster print at?
- Capacitance 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 Capacitance loses nothing.Printing guide
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