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عرض 1951–1965 من أصل 2204 نتائج
Spot Galvanometer
High sensitivity, very useful as null detector. Housed in sturdy plastic case with in-built lamp and scale arrangement, taut band type movement, with Alcomax magnet, clamp and free arrangement for safe transportation, easy replacement of the 6 V lamp, working on 220V A. C. with internal transformer. With a rotary switch for selecting any of the five shunt powers 1, 1/10, 1/100, 1/1000 and short circuit.
Galvanometer resistance : 125 ohms.
Current per mm deflection : 5 x 10-8.
Volts per mm deflection : 6.25 x 10-6.
Critical damping resistance : 1000 ohmsSKU: PH64300St. Louis Motor Demonstration
Students can explore how a simple electric motor works by doing a series of investigations. This St. Louis motor can be adjusted so students can study the effect of voltage and position of the brushes on the commutator. The motor consists of a two pole DC armature. The brush holder, with two heavy binding post terminals, can be rotated for experiments. The permanent bar magnets, supported by clamps, can be adjusted to the desired location. This apparatus requires 4 D cell batteries with holder (not included) or a power supply and two connecting leads (not included).
SKU: PH50215B
