Field directions can be reversed by reversing the ferrite slab magnets and current direction can be reversed by reversing the leads.
The Demonstration Electric Motor is a ready built fully functional unit showing all the essential features of a simple motor as taught in the KS4 syllabus. 
Requires DC voltage in the range 1.5V – 6V.
A single rectangular coil rotates in a linear magnetic field with a simple commutator and brush arrangement. 

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• Apparatus allows students to see density gradients as variations in intensity of illumination. 
• This allows them to see supersonic air flow patterns around models. 
• The mirrors and lenses are of high optic standards to reduce any possibility of optic distortions of the images.
• The apparatus includes digital imaging equipment to record the images, this is useful when using an intermittent supersonic wind tunnel.  
• It also clearly shows shockwaves and expansions, and students can compare their positions and angles with values predicted by theory.

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Science Lab Export Resistors are selected by means of 4mm sockets and can be arranged in series to give the full range from 1 to 12,221Ω. A robust Resistance Substitution Box rated at 2W. A clear connection diagram on the main panel makes the unit easy to use. Resistance range 1 to 12,221Ω

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• A vertical, suction-type wind tunnel with smoke visualisation. 
• Allows demonstrations and student investigations into the flow of air around a wide variety of differently shaped models.  
• A variable-speed fan mounted on top of the wind tunnel produces the air flow through the working section. 
• Students can move the comb from side to side to aid investigations into the aerodynamic properties of a test model.
• A smoke generator connects to a comb mounted in the wind tunnel below the working section.  
• Smoke is produced by the vapourisation of a high-quality food-grade oil. 
• The front wall of the working section of the wind tunnel is transparent and removable. 
• This enables users to easily and quickly attach the optional models to the back of the working section. 
• Lamps illuminate the working section from both sides to improve the visibility of the smoke. 
• The wind tunnel is held on a metal frame fitted with castors for mobility. 
• A control unit on the frame contains the controls for the fan speed.
• A filter helps provide uniform air flow. 
• The smoke is non toxic. Air flow is vertically upwards. 

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An acrylic tube supports an easily moved coil so that a small cylindrical magnet (supplied) can be dropped down the tube to generate a pulse of electricity as it passes through. 
This system provides a simple and effective method of studying Faraday’s Law. 
An oscilloscope is used to monitor the pulse and measure its amplitude. 
PC based oscilloscopes are particularly suited to this equipment and full instructions are included. 
Twin coils, 150 and 300 turns, allows for extra versatility. 
At different speeds the amplitude varies and can be used by senior students to investigate Faraday’s Law while revising equations of motion to determine the speed. 

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Ammeter:
RESOLUTION: 0.01A
ACCURACY: ± 2%
RANGE: 0 to ± 10A d.c.
INPUT IMPEDANCE: 0.01Ω Approx.
INPUT VOLTAGE: 9V PP3 Battery

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The twin coil model has a single turn coil rated at 8A max and 5 turn coil rated at 5A max.
Base dimensions: 150 x 150 x 45mm with connection via 4mm sockets.
Clear acrylic base assemblies which are suitable for bench or overhead projector use.
Can be used to demonstrate magnetic field patterns around conductors using plotting compasses or iron filings. Three types are available requiring a DC power supply capable of providing 5-8A.
15 turn long solenoid
Vertical wire field
Twin vertical coils

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• The two-pen chart recorder, works with Flight Demonstration Wind Tunnel. 
• It has an ergonomic deign.
• For ease of use by students and long-life fibre tip pens, which withstand long-term use in a laboratory.
• Chart width: 200 mm
• Range: 1mV - 50 V
• Configuration: 1 and 2 channel version
• Chart Speed: 16 different from 0,1-20 mm/sec or mm/min
• Features: Separate electric pen-lift per channel

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