Lemon lamp challenge

Includes: Indoors, Technology and science

Activity time:
30 mins


Print this activity pack

Here's the science bit

Lighting up lemons can be huge fun and very educational.


  1. Give each Patrol or group 15 minutes to turn the lemon into a working lamp using the equipment provided.
  2. Once the 15 minutes are up, turn out the lights and give the groups a challenge to complete using the light from their lemon lamps. This could be solving a coded message or similar.

If they are struggling to make it work, here’s how to do it.

  1. Cut the lemons in half and sit each one in an egg cup (optional).
  2. Insert a galvanised nail plus a penny into each lemon half.
  3. Connect one end of an alligator clip to one side of the LED bulb, and then carefully clip the other end of the alligator clip to a nail.
  4. To make a circuit, connect another alligator clip to the penny in one lemon half, and then to the nail in another lemon half. Continue attaching the alligator clips from the penny in one lemon half to the nail in the next.
  5. To complete the circuit, connect the alligator clip from the last penny to the other side of the LED bulb. The bulb should light up.

You can also use potatoes, avocadoes or bananas. Why not use your lemon battery to work a clock or toy?

Planning checklist

Safety notes

Using the web? Follow our online safety guidelines to ensure girls in your unit can surf safely.

Ensure girls are properly supervised when using knives.

Section Number of girls per adult
Rainbows 5
Brownies 8
Guides 12

How many adults are needed?

Use this calculator to find out the ratio of girls to adults that is required for this activity

2 adults needed