Post Office Box, Wheatstone Bridge
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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In Stock
Related Products
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Electricity
Demonstration Transformer Induction Accessory Kit
Includes:
- Copper Coil – With screw clamps to hold a nail for the nail melting demonstration.
- Nails – Steel flat-headed nails 65 x 3 mm or 2½ x 1/8 inch, some with a central groove making the nail thinner at that point.
- Solid and Split Aluminium Rings-Two solid and one split for the ring-launching demonstration.
- Solder Trough – Effectively a single turn coil in the form of a circular trough. Approximately 300 mm of solder is formed into a 50 mm dia meter circle to lie in the trough.
PH50172AC/1 -
Electricity
Earth, Neutral And Live Board Demonstration
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 metres of fuse wire and full instructions. A 12V D.C. power supply is required. Connections are made via 4mm shrouded sockets.PH50136E -
Electricity
Demonstration Transformer Set, Standard
The standard demonstration transformer set allows users to use the traditional 800 turns mains coil instead of the dedicated power supply. This is a more economical option but users do not benefit from the enhanced safety features of Demonstration Transformer Set.
Includes:- 4. U and I Core Set
- 5. 800 Turns Mains Coil.
- 6. 300, 600, 600-0-600, 900, 1800 turns coils.
Additional Items Required but Not Included:
- 4. Induction Accessory Set (PH50172AC/1)
- 5. Motor Accessory Set (PH50172AC/2)
PH50172S -
Electricity
Circuit Breaker Demonstration
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 12VDC 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.PH50136C
