If you have two flashlight bulbs, a flashlight battery, and some wires available, you can try your hand at building your own series and parallel circuits. The wires can be looped around the side of the bulb to hold the bulbs, and the contact with the base may be made to any metal object to which you can touch another wire. The bulb sockets from a flashlight may be useful here.
a. Construct a circuit with the two bulbs in series with one another and with the battery. Note the brightness of the bulbs when they are lit. (They may barely be glowing if you are using just one battery.)
b. Now construct a circuit with the two bulbs in parallel with one another. Note the brightness of the bulbs in this case.
c. Construct a circuit with just one bulb and compare the brightness of the bulb in this situation to the brightness noted in parts a and b.