Breckland Scientific 2021 Catalogue

Electricity & Electronics

Electricity Generation & Transmission

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1 LASCELLS A.C. GENERATOR This apparatus is designed to enable students to investigate the properties of an a.c. generator as used in a bicycle dynamo. A permanent magnet rotates inside a coil of wire. As the field through the coil changes a current is induced in the coil and this is brought out to two 4mm sockets. The unit is transparent, to show all the inner workings, and is a convenient hand held device with a direct drive (no gearing) to the rotating magnet. The output can be displayed on a centre-zero moving coil voltmeter or oscilloscope. The output swings from + to – each revolution and is about 0.5V peak to peak. With the magnitude varying with speed. Because of the geometry of the mechanism the output is not a simple sine wave and if a PC oscilloscope is used to store the trace, the waveform can be studied in more detail. Cat No. Description Price Per HEC-525-110 A.C. Generator 37.94 ea. 2 HAND GENERATOR SET This hand generator provides electrical power for a number of experiments, such as: Electromagnetic forces on a conductor in a magnetic field; Lighting lamps in series and parallel; Comparing loads between filament bulbs and LEDs; Charging a capacitor to store energy. Transparent case to allow inner workings to be viewed. Comes supplied with bulb and lead with crocodile clips. Dimensions: 160 x 100 x 40 mm. Two generators connected together can be used to nicely show energy loss when generating electrical energy. Cat No. Description Price Per HEC-280-100 Hand Generator Set 18.16 ea. 3 LASCELLS ELECTRO MECHANICAL SYSTEM A fool-proof system for allowing students to investigate the raising of a mechanical load by an electrical input. A small d.c. electric motor is geared down to rotate a shaft around which a thread is wound. The thread is attached to a load and the students time the lifting process while noting the electrical input to the system. It enables investigations to be carried out into efficiency, energy transfer, power etc. Useful at all levels from KS3 to Post 16. A limit switch automatically stops the motor when the load reaches the top. Supplied complete with detailed instructions for many investigations at different levels. Cat No. Description Price Per HEC-225-100 Electro Mechanical System 78.93 ea. 4 HIGH VOLTAGE ELECTRICITY TRANSMISSION SIMULATION This ‘National Grid’ simulation apparatus simply and effectively demonstrates how and why electricity is transmitted across national grid networks by high voltage and not low voltage. The safe-to-use apparatus consists of two clear boxes which each house a transformer and associated electric circuitry to step-up and step-down the voltage - providing a simulation of the high voltage output from a power station and subsequent step-down at an electricity sub-station. Each box has a high voltage and low voltage output/ input, to compare the two modes of transmission. The two boxes are linked by plastic insulated resistance wires, via ‘pylons’, to simulate real power lines. The ends of the wires are safely housed in touch-proof plugs which lock into place in the boxes, preventing any possible electric shock. During use, the transmission wires can be lightly gripped to give an understanding of how energy is lost as heat. The 12V SBC bulbs can be connected to the output and input sides of the apparatus, to visibly show the difference in brightness, due to power loss, between transmission at high and low voltages. Both boxes have 2mm output sockets, to allow voltage readings to be taken via the probes of a multimeter or 2mm to 4mm plug leads. Requires 12V a.c. input from a standard laboratory power supply. Comes complete with transmit and receive boxes, insulated resistance wires, two mounted SBC lamps and full instructions. Also available separately is an Earth Return add-on kit, to demonstrate the use of earthing in the National Grid system. Cat No. Description Price Per ELP-350-110 Electricity Transmission Simulation 137.90 ea. ELP-350-120 Earth Return Add-on Kit 17.38 ea.

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A.C. Generator

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Hand Generator Set

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Electro Mechanical System

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Electricity Transmission Simulation showing Earth Return (Inset)

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