A form of computer using electronic or mechanical phenomena to model the problem being solved by using one kind of physical quantity to represent another.
Unlike digital computers, an analog computer does not have generalized computing power (see Church-Turing thesis) and is only useful for the problem it is configured to solve.
Examples of analog computers:
- Tide predictors
- Mechanical integrators
- Target predictors
- Hydraulic model of UK economy
- and (trivially) the slide rule