plained) provide the best form of definition, after all. Consider the definition of magnetic flux density, B = F/I1 sin 0. (3) It will have been noticed that potential difference was defined earlier as power/current, rather than  as  work/charge.  This follows the SI, which defines the volt as the watt per ampere rather than as the joule per coulomb. It may be that the reason for  this  preference is that while we  can easily measure  current  direct it  is difficult to  measure charge direct. The preferred definition is an operational one-it instructs us what  measuring  and mathematical operations have to be performed in order to obtain the quantity we are defining. (4) The point was made earlier that the SI provides one unit only for each quantity. The unit of potential difference is the volt. There is no other. The millivolt and the kilovolt are not units, but a fraction and a multiple of the one-and-only unit. When we write 5 mV, the ‘m’ signifies ‘times and 5 mV = ( 5 x V. It is an essential feature of the SI, as a coherent system, that all derived units are related to other units by equations involving no constants of proportionality other than unity. This requires that there be one unit only for each quantity. So it would be well for examination questions to  be in the  form  ‘Name the unit of potential difference’, not ‘Name a unit of potential difference’.

http://iopscience.iop.org/article/10.1088/0031-9120/18/6/307/pdf

A modular system of interfacing microcomputers

/pdf/interfacing-microcomputers-to-science-experiments-2x4009w9k4.pdf

Interfacing Microcomputers to Science Experiments

neck and  the  ankle values both before and after exercise were calculated using the Student T-test. The results  suggest that responses are generally slower after exercise but with no appreciable increase in delay between the foot and the head. Furthermore, responses appear more spasmodic from the foot after exercise ( p and  standard eviation larger). Such results may be of interest to the footballer or car driver! It is interesting too to compare these results with a wider variety of reaction times, this  time measured on a member of the technical staff (table 2). Notice how more careful rehearsal and performance of the experiment in this case reduces the standard deviation of the results. With regard to light and sound the Griffin reaction time  apparatus was  used but  the switches were replaced by a more positive and quieter variety. Here the  experimenter presses  a two-way switch which both  turns  on a  light or buzzer and  starts  the millisecond timer. The subject, on seeing the light or hearing the buzzer, presses a switch to stop the timer. The tendon jerk reflex reaction time was measured by

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