“I made my own circuit to light my bulb” was the third activity aiming to understand the electrical current and its usage in daily life. In that, each group constructed two ways of aluminum folio from a bulb to a battery adhered onto a hard cartoon. After that cables were adhered to the ends of the battery and also a bulb. The participants saw when the cables made in touch with the way they produced, the bulb lighted on. In the pre-evaluation form, they were asked to sign the objects capable of conducting an electrical current, while in the final assessment; they were asked to complete the circuit with a true object.