Introduce kids in a fun way to parallel circuits with just aluminum foil, leds and a battery!
You will need:
creativity, aluminum foil, three LEDs, coloured paper, glue, tape, a pin, scissors and a 3V power source (a battery or a small solar panel.)
Step 1: Design Your Postcard
Compose your postcard. Cut out the grass, a butterfly, a flower and the sky. Glue everything to a white paper.Use the pin to make 6 holes (2 for each of the LEDs).
Step 2: Connecting the LEDs in Parallel
Put the legs of the LEDs through the holes and flaten them by bending sideways (see photo). Make sure that all shorter legs (negative) are pointing up and all longer legs (positive) are pointing down. Cut out two stiprs of aluminum foil. Pull the under the legs of the LEDs. The strips should not touch each other to avoid a short circuit. Attach the legs of the LEDs to the aluminum with a scotch tape. The LEDs are now connected in parallel, with the aluminum strips acting as conductors.