Name any devices other than the three mentioned in Section 31. 1-battery, solar cell, and electric generator that can act as a power source in an electric circuit.

Data from Section 31. 1

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One familiar way to make electricity do something use- ful is to connect a battery to a light bulb. To do so, we connect each terminal of the battery to one of the two contacts on the light bulb (Figure 31.1a). On incandescent light bulbs (discussed throughout this chapter), the two contacts are the threaded metal casing and a metallic "foot" that is separated from the casing by an insulator (Figure 31.1b). Inside the bulb, each contact is connected by a metal wire to one end of a tungsten filament, a very thin wire of tungsten wound in a tight coil. When con- nected as shown in Figure 31.1, the wires, contacts, and filament form a continuous conducting path from one terminal to the other, and charge carriers flow through the filament. The current in the filament causes the fila- ment to become white hot and glow. (Tungsten is used for light bulb filaments because its very high melting temperature allows it to glow and not melt.)