Breckland Scientific 2021 Catalogue

Electrical Accessories

Capacitors & Capacitance

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1 10F SUPER CAPACITORS These capacitors work like rechargeable batteries. They charge in seconds and can be used to power lamps, motors etc. Clearly demonstrates the principles of capacitance and discharge. Cat No. Description Price Per ELP-050-100 10F Capacitor 4.32 ea. 2 CAPACITANCE SUBSTITUTION BOX An easily selectable range of 12 preferred value capacitors from 100pF to 0.47µF. Values are: 100pF, 220pF, 470pF, 1nF, 2.2nF, 4.7nF, 10nF, 22nF, 47nF, 0.1µF, 0.22µF and 0.47µF. Voltage rating for each range is 50V a.c. or d.c. Housed in a robust ABS plastic case 75x100x40mm with rotary selector switch and a pair of 4mm sockets. Cat No. Description Price Per ELP-070-100 Capitance Substitution Box 41.54 ea. 3 PARALLEL PLATE CAPACITOR This Parallel Plate Capacitor apparatus demonstrates the working of a capacitor and the dependence of capacitance on the distance between the plates and also the nature of the medium between them. It consists of 120mm circular metal discs mounted on insulated supports which slide on an extruded aluminium section to allow adjustment of the distance between the two discs, which can be read directly from the scale fixed on the aluminium section. Supplied with three different dielectric materials. Cat No. Description Price Per ELP-040-100 Parallel Plate Capacitor 55.67 ea. 4 LASCELLS EARTH NEUTRAL LIVE DEMO This apparatus is an effective demonstration of how the earth wire and fuse act together to protect both the user and the appliance. The apparatus can be set up to demonstrate and explain: The safe wiring of an appliance; the danger of an unearthed appliance; the action of a fuse. In use the appliance is connected correctly and the LEDs in the kettle will illuminate to show the appliance is working. A fault is then demonstrated by swapping the live wire from inside the kettle to the case. This will demonstrate either the fuse melting and protecting both the user and appliance, or in the case of no earth wire, the LEDs illuminate to indicate the passage of current through the person to ground. The apparatus is clearly labelled and allows the tracing of current from the ‘power station’ through the 13A socket, plug and appliance through the live wire and back through the neutral wire. In addition, the layout of the 3 pin plug is positionally correct to reinforce the wiring layout and the position of the fuse. The fuse is easily visible and can be seen to ‘blow’ when a fault occurs. The unit is supplied with 10 metres of fuse wire and full instructions. A 12V D.C. power supply is required. Connections are made via 4mm shrouded

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10F Capacitor

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Capacitance Substitution Box

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sockets. Cat No.

Description

Price Per

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ELM-150-200 Earth Neutral & Live Demo

88.37 ea.

Parallel Plate Capacitor

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4

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Earth Neutral & Live Demo

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163

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