1.   At the end of its swing, the weight smacks into a tiny electrical contact, closes a circuit and allows the gizmo to record the step.

2.   A plastic tab keeps two electrical contacts from touching each other and closing a circuit.

3.   Johnson of the Naval Research Laboratory imagines reprogrammable computer chips where flipping a spin opens or closes a circuit.

4.   The caps work like a switch -- they close a circuit when on and leave it open when they are removed.

5.   The circuit was already closed on its own, so the worshiper technically had nothing to do with it.

6.   This closes a circuit and sends an impulse that starts the engine.

7.   This test actually shorts out the button and closes the circuit.

8.   When someone pushes the button, it closes the circuit and allows power to flow from the transformer to the chimes.

9.   When the temperature drops below freezing, the thermostat closes the circuit and activates the heating cable.

10.   Birds with larger wingspans, like raptors, run the highest risk of electrocution, which occurs when their bodies close a circuit between two wires.