<P> The core mathematical operations used in an electric analog computer are: </P> <Ul> <Li> addition </Li> <Li> integration with respect to time </Li> <Li> inversion </Li> <Li> multiplication </Li> <Li> exponentiation </Li> <Li> logarithm </Li> <Li> division </Li> </Ul> <Li> integration with respect to time </Li> <P> In some analog computer designs, multiplication is much preferred to division . Division is carried out with a multiplier in the feedback path of an Operational Amplifier . </P>

Which of the following is an example of an analog input device