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WATER CIRCUIT BOARD
 
WATER CIRCUIT BOARD (1588)
Analogue apparatus to illustrate electrical current flow. Consists of a large board on which is mounted a low voltage electrical pump which circulates the water through the 'circuit' of clear plastic tubing connected to glass tubes of differing bores representing resistances. Across the 'resistances' is a detachable manometer to show the 'potential difference'. Following the resistance is a taped tube discharging into a funnel so that rate of flow representing current may be show.

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