Eduqas gives A Level students a data booklet, and it’s easy to assume that means the equations are taken care of. They aren’t. Some of the equations students use most often are not in it, a handful must be derived on demand, and the booklet tells you nothing about the mistakes examiners see every year.
So I’ve put every key equation for Eduqas A Level Physics into one free slideshow.
Learn it, practise it, check it
There are 107 equations across all three components and all four options. Each one gets three slides:
- Learn – the equation, what every symbol means with its unit, a worked example, and an examiner’s tip.
- Practise – three questions that get harder: a warm-up, an application, and a stretch.
- Check – full answers with working, and a common mistake to watch for.
The constants and conventions match the WJEC/Eduqas data booklet, so answers use 1/4πε₀ ≈ 9.0 × 10⁹ and H₀ = 2.20 × 10⁻¹⁸ s⁻¹, and displacement is x, as it is on the paper.
Not in the data booklet
Every equation slide carries a badge saying whether it’s in the booklet, partly in it, or not in it at all. The “not in it” list surprises people. It includes:
- E = hf – the booklet has the photoelectric equation, but not the photon energy on its own
- Faraday’s law and emf = Blv
- r = mv/Bq for a charged particle in a magnetic field
- The rules for resistors and capacitors in series and parallel
- I = P/4πd² for the intensity of a star
- ½mc̅² = (3/2)kT for the mean kinetic energy of a molecule
In the topic menus, a yellow dot marks every equation that isn’t fully in the booklet, so students can see at a glance which ones to learn.
Derivations, needed and stretch
The specification names eleven derivations students must be able to reproduce, including the SUVAT equations, I = nAve, Kepler’s third law, the critical density of the universe, λ = ln 2/T½ and the resonance frequency for Option A. Each one is in the slideshow straight after its equation, in two to four short steps, marked Needed.
There are eight more marked Stretch. They aren’t required, but most cover equations that aren’t in the booklet – P = Fv, vₘₐₓ = Aω, escape velocity, the range of a projectile – so deriving them is often quicker than memorising them.
What the examiners keep saying
The common mistakes on the answer slides are mostly taken from the Eduqas examiners’ reports, and a few come up so often they’re worth repeating here. Leaving out the 4 in the surface area 4πr² when using Stefan’s law. Writing V = IR as a statement of Ohm’s law without “at constant temperature”. Naming “centripetal force” as one of the forces on an object moving in a circle, when it is the resultant of the real forces, not an extra one.
There’s also extra practice on resolving forces, harder moments problems and projectiles, and summary slides of what the examiners’ reports say for each component.
How to use it
Download it and run it as a slideshow: the menus are clickable, so you can go straight from the main menu to Component 2, then to Kepler’s third law, then on to its derivation, without scrolling through three hundred slides. In a lesson, the practise slide works well on its own – put it up, give students a few minutes, then click through to the answers.
Independent revision resources. Not published by or affiliated with WJEC or Eduqas.
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