The separation can be measured by using a direct reading ‘wedge’ gauge and the force is provided by applying standard slotted masses on the top plate. 
A simple system for investigating the force of repulsion between two high strength neodymium magnets.
Investigate magnetic repulsion and balanced forces.

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The Primary coil has tappings at 200, 400 and 600 turns while the Secondary has 100, 200, 300, 400, 500 and 600 turns all brought out to 4mm sockets. 
Trans-Ratio is a fully self-contained transformer system which enables students to investigate turns ratios and efficiency with the minimum of complication. 
Full instructions supplied with experiment details etc.
For teaching transformer operation. Demonstrate changing number of turns. Can be used to demonstrate induction.
An AC supply of up to 6V is required with AC voltmeters for monitoring purposes. 
Size: 180 x 100 x 75mm.

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• The apparatus has two transparent tanks, mounted one above the other. 
• A float switch in the reservoir monitors the level of water. 
• An in-line flow sensor provides a pulsed output.  
• A variable-speed pump transfers water from the reservoir into the upper tank. 
• The water can drain down to the lower tank and then back into the reservoir.
• Solenoid valves may be individually opened or closed to control and redirect the movement of the water. 
• The pump control is on or off, but a manual control allows the user to set the speed. 
• Each tank includes two level sensors which measure maximum and minimum water levels. 
• Its frequency is proportional to the flow rate and the number of pulses proportional to volume. 

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The wands make the magnets safe for pupil use.
A set of 5 acrylic wands each fitted with a powerful 12mm diameter Neodymium button magnet. 
Dimensions: 125 x 20 x 10mm

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The complete system enables the properties of radio communications to be examined in terms of directionality, shielding, range etc., particularly as a comparison with other communication systems such as IR controllers, light, microwaves etc.
The system consists of a 433MHz low power transmitter and matching receiver. 
The transmitter sends out a variable audio tone and the receiver has a built-in loudspeaker. 
Each unit measures 90 x 60 x 20mm excluding aerials and requires a 9V PP3 battery.

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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 danger of an unearthed appliance.
The safe wiring of an appliance.
The action of a fuse.

The apparatus is clearly labelled and easily 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.
Science Lab Export, 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 to show either the fuse melting and protecting 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 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 sockets.
The fuse is easily visible and can be seen to ‘blow’ when a fault occurs.

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The unit is supplied complete with 2 ferrite magnets, an eddy current pendulum demonstration and universal accessory bracket.
Science Lab Export Consisting of a steel frame with lockable, adjustable jaws which will accept 50 x 20mm ferrite slab magnets or neodymium button magnets. 
The field strength can be changed by adjusting the distance. 
Use with the Coil to determine the flux density in the gap. 
Dimensions: 120 x 50 x 50mm
Mass 0.25kg

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Power rating 1W continuous. 4mm sockets allow the unit to be used as a potential divider.
A four decade resistance box covering 1Ω to 9999Ω in 1Ω steps. 
Resistors are 1% tolerance. 
Max current 0.35A. 

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