Physics

Slide wire pattern with four gaps for known and unknown resistors. A straight resistance wire stretched along metric scale mounted on wooden base. Wire can be easily replaced if damaged or broken. Complete with jockey. All connections are low resistance and via standard 4 mm sockets. Length: 1.5 m.

Slide wire pattern mounted on rigid anodized aluminium base fitted with a metric scale with two equal lengths of constantan wire running across their length. Connection to the resistance wires is made via 4 mm sockets. Resistance wires located along the meter rules, giving total length of 2 metres. Complete with knife jockey. Resistance of wire approx 2 Ω/m.

Jockey for Potentiometer

A four decade resistance box covering to 9999Ω in 1Ω steps. Plastic enclosure box with resistance values 5% tolerance. Dimensions (L x W x H): 165 x 80 x 50 mm.

This apparatus provides the basis for student investigations into resistance. Four wires, 500 mm long mounted on an acrylic base and connected via 4 mm sockets. The wires are all Nichrome with diameters of 1.0, 0.8, 0.63 and 0.4 mm giving resistances in the range 0.4 to ohms. A graduated mm scale is included allowing resistance length and resistance This apparatus provides the basis for student investigations into resistance. diameter investigations to be easily covered. Dimensions (L): 500mm.

Mini substitution unit using a single rotary switch to select from twelve values all at 5% 0.5 W. Values in are 100, 330, 470, 680, 1k, 3.3k, 4.7k, 6.8k, 10k, 33k, 47k and 100k. Connections via 4 mm sockets.

A decade resistance substitution box ideally suited for school or college use. The box will simulate resistances from to 999,999 Ω in 1 Ω steps. The value selected is clearly indicated on the dials.

This apparatus contains an NTC bead thermistor with nominal resistance of 4.7 kΩ in a glass tube with electrical connection made by means of 4 mm sockets. Students from KS3 to Post-16 can carry out practical investigations into the thermistor characteristics. Full instructions and specimen results included. Dimensions (L): 220 mm.

Conducting putty is a useful aid to teaching resistivity and the relationship between length and cross-sectional area on resistance. A cylinder 60 mm long and 20 mm in diameter has a resistance of approximately 20 Ω. Can readily be connected into an electrical circuit and both length and diameter can easily be altered by 're-moulding' the putty. Although harmless, plastic gloves are provided to prevent hands from becoming stained. Approx. 100 g.

A 4 mm screw-socket which can be mounted on to panels up to 12.7 mm thick. Supplied in packs of 5. • Current: 10 max • Height above panel: 24-32 mm • 14 mm outer diameter • Thread size 4BA

A 4 mm screw-socket which can be mounted on to panels up to 12.7 mm thick. Supplied in packs of 5. • Current: 10 max • Height above panel: 24-32 mm • 14 mm outer diameter • Thread size 4BA

A handy sized, more environmentally friendly lead-free alloy solder which contains non-corrosive flux. Size: 1 mm dia. X 2 m long. Contains 99.3% tin and 0.7% copper.

General purpose soldering iron to BS3456 (2.14) featuring the same double shaft principle as CS-18. Very low current leakage (1 uA maximum). 230V AC with PVC cable and fitted 13A mains plug to BS1363A. Supplied with 3 mm bit. Operating tip temperature: 420°C.

A range of sturdy, mounted coils, designed for use with laminated cores and clips. The coils have different numbers of turns of copper wire, allowing students to investigate the relationship between voltage and number of turns, showing how transformers work etc. They can also be used to demonstrate electromagnetic induction (Faraday's law). Coils come complete with 4 mm sockets and include these coils: 50+ 100 turns; 200+ 300 turns; 300+ 350 turns; 400+ 500 turns; 550+ 600 turns.

Spare C Core and clip for Westminster Electromagnetic Kit MA91525.

Laminated U-core with armature and clamp screw. Cross sectional area: 20 x 20 mm.

Laminated I-core. Dimensions (W x H x L): 20 x 20 x 83 mm. Mass: 225 g.

Coils to fit EL150800 and EL150806. Made of coloured plastic with 4 mm safety jack connectors. Armatures available separately. The coils are provided with transparent, adhesive polyester foil with effective voltage insulation up to 4500 V to reduce the risk of electric shock. • Hole size: 20.5 x 20.5 mm • Max. current: 2 A • Resistance: 0.7 Ω • Thread diameter: 0.9 mm • Inductance: Approximately 680 µH

Coils to fit EL150800 and EL150806. Made of coloured plastic with 4 mm safety jack connectors. Armatures available separately. The coils are provided with transparent, adhesive polyester foil with effective voltage insulation up to 4500 V to reduce the risk of electric shock. • Hole size: 20.5 x 20.5 mm • Max. current: 2 A • Resistance: 0.7 Ω • Thread diameter: 0.9 mm • Inductance: Approximately 680 µH

Coils to fit EL150800 and EL150806. Made of coloured plastic with 4 mm safety jack connectors. Armatures available separately. The coils are provided with transparent, adhesive polyester foil with effective voltage insulation up to 4500 V to reduce the risk of electric shock. • Hole size: 20.5 x 20.5 mm • Max. current: 2 A • Resistance: 0.7 Ω • Thread diameter: 0.9 mm • Inductance: Approximately 680 µH

Coils to fit EL150800 and EL150806. Made of coloured plastic with 4 mm safety jack connectors. Armatures available separately. The coils are provided with transparent, adhesive polyester foil with effective voltage insulation up to 4500 V to reduce the risk of electric shock. • Hole size: 20.5 x 20.5 mm • Max. current: 2 A • Resistance: 0.7 Ω • Thread diameter: 0.9 mm • Inductance: Approximately 680 µH

For building a simple galvanometer. The insert consists of a permanent magnet with a pointer. The device is fitted with 0-centre scale. Compatible with coils EN140105-EN140120

A laminated, low loss core on which to attach coils in different combinations to demonstrate the principle of step-up and step-down transformers. Various coils can be used for GCSE physics and A-Level physics to show how transformers are used in domestic electrical appliances and in the National Grid for power transmission. Demonstrations work well with the Interscale Demonstration Meter EL52300. The core is made up of highly permeable U-shaped metal sheeting, which can be closed via two clamps with tightening screws. The cross-section of the core measures 40 x 40 mm. Contents: • Transformer core • 1x 6000 turn, 0.2 A coil, with tappings every 2000 turns • 1x 1200 turn, 1.25 A coil, with tappings at 300 & 600 turns • 1x 72 turn, 12 A coil, with tappings at 6, 30, 54, and 66 turns • 1x 600 turn, 2.5A coil, with mains input, switch and protective fuse The Premium Version is supplied in Gratnells tray with insert.

A laminated, low loss core on which to attach coils in different combinations to demonstrate the principle of step-up and step-down transformers. Various coils can be used for GCSE physics and A-Level physics to show how transformers are used in domestic electrical appliances and in the National Grid for power transmission. Demonstrations work well with the Interscale Demonstration Meter EL52300. The core is made up of highly permeable U-shaped metal sheeting, which can be closed via two clamps with tightening screws. The cross-section of the core measures 40 x 40 mm. Contents: • Transformer core • 1x 6000 turn, 0.2 A coil, with tappings every 2000 turns • 1x 1200 turn, 1.25 A coil, with tappings at 300 & 600 turns • 1x 72 turn, 12 A coil, with tappings at 6, 30, 54, and 66 turns • 1x 600 turn, 2.5A coil, with mains input, switch and protective fuse The Premium Version is supplied in Gratnells tray with insert.

To fit the EL180820 demountable transformer kit. Fits 40 x 40 mm core.

To fit the EL180820 demountable transformer kit. Fits 40 x 40 mm core.

To fit the EL180820 demountable transformer kit. Fits 40 x 40 mm core.

To fit the EL180820 demountable transformer kit. Fits 40 x 40 mm core.

To fit the EL180820 demountable transformer kit. Fits 40 x 40 mm core.

Used to demonstrate that a step down transformers can produce currents that are large enough to weld metals or boil water.

Lenz's law transformer accessory kit to demonstrate the production of large magnetic fields and Lenz's law damping on pendulums with and without slits.

Torch bulbs.

12 V, 24 W bulb, with SBC fitting, and axial (vertical) filaments. Suitable for ray boxes. Dimensions 55 x 38 mm (L x Dia)

To safely demonstrate the need for high voltage transmission of electricity. This apparatus clearly demonstrates how this is achieved using the interconnected boxes through which pupils can see the components. The high and low voltage sides are clearly indicated, with resistance wires connected to either side for direct comparison of lamp brightness/energy loss. By gripping the insulated cables the energy loss can be felt in the form of heat. There are also voltmeter sockets for measuring the high voltage. Comes complete with two boxes (transmit and receive), insulated resistance wires, two mounted SBC lamps and full instructions. Touchproof, locking high voltage connectors used throughout it is virtually impossible to get an electric shock Clear lid to the casing so pupils can see how it works and trace the circuit Indicators for low/high voltage Voltmeter sockets for measuring the high voltage Supplied with 2 x kits to make up the pylons AC Power supply and Connection wires are not supplied An additional power supply is required to carry out this experiment, capable of supplying 12V at 5A. Also required are 6 x connecting leads.

Rep HT Leads for EL71435 Mk2

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel.

Supplied on reel.

Supplied on reel.

Supplied on reel.

Supplied on reel.

Supplied on reel.