Breckland Scientific 2023 Catalogue

Electricity

Resistors & Resistance

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1 THERMISTORS A range of NTC (Negative Temperature Coefficient) miniature disc thermistors, for general purpose applications such as temperature measurement and thermal compensation circuits. Also useful in the classroom for demonstrating how the resistance changes with temperature. A thermistor is a temperature dependant resistor or ‘thermal resistor’. Working temperature range of -30°C to +125°C with a tolerance of 10%. Cat No. Description Price Per ECO-370-050 Thermistors 100Ω 4.83 10pk ECO-370-100 Thermistors 300Ω 3.41 10pk ECO-370-150 Thermistors 1KΩ 4.80 10pk ECO-370-200 Thermistors 5KΩ 3.60 10pk ECO-370-250 Thermistors 20KΩ 4.73 10pk 2 THERMISTOR INVESTIGATION - BASIC This apparatus contains a negative temperature coefficient (NTC) bead thermistor enclosed within in a glass tube. Electrical connection is made via 4mm sockets at the top of the unit. Students can investigate the characteristics of a thermistor, usually by measuring the resistance of the thermistor at different temperatures with a multimeter or other meter. The device has a nominal resistance of 4.7KΩ at 25°C. At 0°C this resistance would rise to about 15KΩ and at 100°C the resistance would drop to around 300Ω. Instructions and example results are included. Cat No. Description Price Per ELR-700-100 Thermistor Investigation - Basic 18.13 ea. 3 LASCELLS THERMISTOR SYSTEM This apparatus contains an NTC bead thermistor with a nominal resistance of 4.7kΩ in a glass tube with electrical connection made by means of 4mm flying leads. Students from KS3 to Post-16 can carry out practical investigations into thermistor characteristics. Full instructions and specimen results included. Cat No. Description Price Per HTC-365-100 Thermistor System 25.83 ea. 4 LIGHT DEPENDENT RESISTOR NORPS12 Photoconductive cadmium sulphide cell with a spectral response similar to the human eye. As light falling on the cell increases, so the resistance of the cell decreases. Peak spectral response: Typically. 550nm. Cell resistance: 9K Ohm at 10 lux. 400 Ohm at 1000 lux. Dark resistance: Min. 1M Ohm. Pack of 5. Cat No. Description Price Per ECO-150-100 Light Dependent Resistor Pack 19.52 5pk 5 MINIATURE LIGHT DEPENDENT RESISTOR Photoconductive cadmium sulphide light dependent resistor (LDR) in a miniature 4mm dia. epoxy sealed frame. Cell resistance reduces as light falling on the device increases. Typical applications include light control, cameras, toys etc. Sold as a pack of 10.

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Thermistors

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Thermistor System - Basic

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Thermistor System

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• Peak spectral response: 540nm. • Light resistance: 50-100Kohm • Dark resistance: 20Mohm minimum • Max. voltage: 100V • Power max: 90mW • Working temp. range: -20 to +60° Cat No. Description

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ECO-130-100 Miniature Light Dependent Resistor

2.55 10pk

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Light Dependent Resisitor

Minature Light Dependent Resisitor

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