Analog computer is a device that solves problems by working directly with a physical quantity, such as weight, voltage, or speed, rather than with digits that represent the quantity. The computers solve problems by measuring one quantity in terms of another quantity. In a problem involving water pressure and water flow, for example, electrical voltage might serve as an analogue (likeness) for the water pressure, and electric current for the water flow. Many familiar devices, including speedometers, thermometers, and thermostats, operate on the same basic principle as analog computers. For example, a thermometer measures temperature in terms of the length of a thin line of liquid in a tube. An analog computer presents output data in a continuous form, often as a position on a scale. In some cases, the data are displayed as electrical signals on an instrument called an oscilloscope.
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