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HomePhysics & Electronic InstrumentsElectricity Post Office Box, Wheatstone Bridge
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Post Office Box, Plug Type
Post Office Box, Plug Type
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Decade Inductance Box – 3 Dial
Decade Inductance Box – 3 Dial

Post Office Box, Wheatstone Bridge

Description

With two ratio dials of 10,100 and 1000 ohms each and a resistance arm of four dials, each of ten coils of 1, 10, 100 and 1000 ohms, giving total resistance of 11,110 ohms with 4 mm socket terminals for battery, galvanometer and unknown resistance.
Highly stable resistances are used.
Accuracy ±0.1%

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St. Louis Motor Demonstration

Description

Students can explore how a simple electric motor works by doing a series of investigations. This St. Louis motor can be adjusted so students can study the effect of voltage and position of the brushes on the commutator. The motor consists of a two pole DC armature. The brush holder, with two heavy binding post terminals, can be rotated for experiments. The permanent bar magnets, supported by clamps, can be adjusted to the desired location. This apparatus requires 4 D cell batteries with holder (not included) or a power supply and two connecting leads (not included).
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Circuit Breaker Demonstration

Description

Investigate the working principle of circuit breaker type fuse with this demonstration model. The apparatus is built on a robust plastic base and includes resistive loads to simulate external wiring circuits. Applications of the thermal response of bimetal strips and also electromagnetism (movement from a solenoid) are clearly demonstrated in this model. When a 12 V DC supply is connected (not supplied) the LED lights to show that current is flowing in the external circuit and the bi-metal strip can be seen to bend as its heater coil raises the temperature. After a few minutes the bending is sufficient to trip the mechanism and the current path is broken. At any current selection a short circuit situation can be initiated by pressing the red button and this produces an immediate response from the solenoid to disconnect the supply.
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Westminister Electromagnetic Kit

Description

A very effective and motivating learning aid in elementary electromagnetism. Consists of 8 anisotropic alloy magnets, 8 ceramic ferrite magnets, 4 steel magnet yokes, 6 plotting compasses, 4 hardboard formers to take compasses, 1 bottle iron filings 250 gm, 4 dispensers for iron filings , 4 double C-cores, 4 clips for C cores, 4 Aluminium rings, 4 Aluminium split rings, 4 armatures with axle tubes, 4 Aluminium axle rods, 8 split pins, 16 rivets, 4 formers for coils, 4 reels cello tape, 4 reels copper wire, 4 sheets white pasteboard, 4 plain postcards, 4 reels white cotton thread, 1 length latex rubber tubing, 4 each resistors 100 ohms and 10 ohms, 4 support bases, 10 MES bulbs, 8 MES bulb holders,1 wood clamp and 1 wooden block. With instructions.
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Electric Bell

Description

Twin coil, in plastic cover, operates from 3 – 6 V AC / DC.
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Earth, Neutral And Live Board Demonstration

Description

This apparatus is an effective demonstration of how the earth wire and fuse act together to protect both the user and the appliance. When the appliance is connected correctly and the LEDs in the appliance will illuminate to show the appliance is working. A fault is then demonstrated by swapping the live wire from inside the appliance to the case to show either the fuse melts (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 fuse is easily visible and can be seen to ‘blow’ when a fault occurs.The unit is supplied with 10 m of fuse wire and full instructions. A 12 V DC power supply is required. Connections are made via 4 mm shrouded sockets.
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Electric Motor Model

Description

With this simple electric motor model students can investigate the relationship between voltage supplied to rotor and polarity / position of magnets. On applying 6V DC to 4mm sockets, the rotor will begin to rotate across its vertical axis.
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Dynamo

Description

With driving wheel, to generate current, mounted on polished wood base with driving wheel in vertical position, a lamp holder and a lamp. Output DC Current Output both DC and AC current
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Model AC DC Generator

Description

Generates both AC and DC. When the two brushes of the generator are put in the two ends of the commutator, the output is an AC. When the brushes are put in the middle of the commutator, the output is a DC. Includes Instructions.
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