The fuel and the oxygen are fed in from outside the cell.
It keeps working for as long as hydrogen is supplied.
Refuelling takes a few minutes.
The only product is water. Nothing else comes out.
It stays light, because the fuel is not carried inside it.
Hydrogen is a gas, so it is hard to store and to move safely.
Making the hydrogen uses energy, often from fossil fuels.
Rechargeable battery
Everything it needs is sealed inside it.
Nothing at all is given out while it is being used.
Charging points are far more common than hydrogen pumps.
It runs down and has to be recharged.
Recharging takes hours, not minutes.
It is heavy, because the chemicals are carried inside it.
The metals have to be mined, and the charging electricity may come from fossil fuels.
2H₂ + O₂ → 2H₂O
Accessibility — Adapt
Theme
Dark navy theme
Colour overlay (Irlen)
Off
Display
Reading ruler
Wider spacing (dyslexia)
Text size
100%
High contrast
Classroom / projector mode
Method checklistLists the four steps along the bottom and ticks them off as you go.
ReadingsShows the voltmeter, the hydrogen left and the water made along the bottom.
Outline the apparatusDraws a dark edge round the equipment so it stands out from the bench.
Label detailHow much writing floats in the scene. Key words shows one or two cards at a time, and only the ones the step needs.
Key words
Chemistry
Alkaline electrolyteOn: potassium hydroxide, and OH⁻ ions cross the cell. Off: a polymer membrane, and H⁺ ions cross instead. Match this to your textbook.
Procedure
Buttons onlyAdds a named button for every move, so nothing has to be tapped in the 3D scene.
Extra slowStretches out the run and the refuelling, so there is longer to look at what happens.
Motion & colour vision
Show moving particlesThe gas molecules, the ions and the electrons. Turn off for a still picture.