Round (Short) Light Bulb. Place up to five round light bulbs (out of sockets) in the simulation window. You attach wires to the light bulb's two nodes, which are indicated by the yellow rectangles in Figures 1 and 2. This element has an alternative view. Except for the facts that it has a different burn-out current and a correspondingly different default resistance (10 ohms rather than 40 ohms), this element is otherwise identical to the tall light bulb.