Quick answer. In this range of more than two hundred items, coded E-0001 upwards, the key decision is to order by the figures, not the variant number. Most of the listing is families with numbered variants - accumulators, connecting leads, capacitors, decade boxes and inductance boxes from type one to type eight - and a type number tells you no voltage, capacity, length or resistance. So name the family and state the figures: for leads the plug diameter, length and current rating; for decade boxes the tolerance per decade and residual resistance; for rheostats the current rating at every slider position. Then have them confirmed in writing against the code.
This is the largest range on the site: more than two hundred items, coded E-0001 upwards across twenty-two listing pages, covering everything an electricity laboratory consumes and most of what it uses. Accumulators, capacitors and inductors, connecting leads in two plug sizes, bulbs and holders, component holders, decade resistance, capacitance and inductance boxes, rheostats, meters and demonstration machines.
One thing to understand before you read the listing. Most of the range is organised as families with numbered variants: accumulators type one to type eight, connecting leads type one to type eight in each plug size, capacitors, decade boxes and inductance boxes the same. That variant number is not a specification. "Type 3" does not tell you a voltage, a capacity, a length or a resistance, so for anything in this range the useful enquiry names the family and asks for the figures, and the figures to ask for are set out below family by family.
| Family | The figures that identify what you want |
|---|---|
| Accumulators | Nominal voltage, capacity in ampere-hours, chemistry, whether sealed or vented, terminal type, dimensions and mass, charging current and whether a charger is supplied |
| Connecting leads | Plug diameter, two or four millimetre, length, whether the plugs are stackable, conductor cross-section and current rating, insulation, colour, and the price per hundred |
| Capacitors and condenser boxes | Capacitance and tolerance, working voltage, dielectric type, whether polarised, and for a box the range, the step and the switching |
| Decade resistance boxes | Total range and smallest step, tolerance of each decade, power rating per decade, and the residual resistance of the switches, which sets the lowest usable value |
| Decade capacitance and inductance boxes | As above, plus the resistance of each inductor winding, since an inductor brings its own resistance into the circuit |
| Rheostats | Resistance, current rating, whether the rating holds at every slider position, construction and whether the winding is open or enclosed |
| Bulbs and holders | Bulb voltage and wattage, the holder fitting it matches, whether the holder is mounted or loose, and the price in boxes of a hundred |
| Meters | Range, accuracy class, internal resistance, moving coil or moving iron, terminal type and overload protection, all set out at length under Electricity and Cell Lab |
Eight accumulator codes head this listing and they are the only items in the range that need a safety brief. Ask the chemistry first, because everything else follows from it. For a vented lead-acid accumulator, which is what a traditional school laboratory holds:
For most school electricity practicals a low-voltage bench supply is the better answer than a bank of accumulators, and it needs no charging regime, no ventilation and no acid. Buy accumulators where the syllabus names them, for internal-resistance and terminal-voltage experiments, rather than as a general supply.
A charged capacitor holds energy and keeps holding it after the circuit is switched off. For the larger values in this range, and for the charging and discharging demonstration boards (E-0048, E-0049), make it a standing rule that a capacitor is short-circuited through a resistor and checked before anyone handles it, and that boards are put away discharged. Ask whether the demonstration boards include a bleed resistor and a discharge link, and ask the working voltage of every capacitor, because a capacitor used above its rating fails, sometimes energetically. Ask also whether any are polarised, since an electrolytic capacitor connected the wrong way round is the other way these fail.
Four-millimetre leads, bulbs and crocodile clips are what an electricity laboratory gets through, and a practical stops when the box is empty rather than when the apparatus fails. Three things are worth doing at the order stage. Standardise on one plug size. This range offers both two-millimetre and four-millimetre leads, and a laboratory holding both ends up with half its leads unusable in half its sockets, so pick the size your meters and boards take and buy only that. Specify stackable plugs, which let two leads share one terminal and remove the commonest reason a student circuit will not go together. And buy bulbs and leads in quantity with the apparatus, asking the price per hundred, rather than ordering them again in six months at single-item prices.
For the component holders (E-0082) ask what they hold and whether they accept the component lead diameters you use; for the bulb holders, ask the fitting and confirm it matches the bulbs you are ordering, since a holder and a bulb of different fittings is a common and annoying mismatch.
These are the reference components in bridge, potentiometer and time-constant experiments, so their own accuracy sets the accuracy of the result. Beyond the range and step, ask for the tolerance of each decade and whether a calibration certificate is available; the power rating per decade, because the low-value decades overheat first and that is where most of the current goes; and the residual resistance of the switches and internal wiring, which is the lowest value the box can actually present and matters in any low-resistance measurement. On the inductance boxes, ask the resistance of each winding as well as its inductance.
For rheostats, ask the resistance and the current rating, and then ask the question that catches people out: whether that current rating applies with the slider at any position. A rheostat used as a potential divider with most of the winding out of circuit concentrates the dissipation in a short length of wire, and that is how a rheostat burns out. Ask whether the winding is enclosed or open, since an open winding is hot to the touch in normal use.
Several families in this listing appear elsewhere under other code series, so ask the supplier to confirm which product you are being quoted and which is current. The demonstration motor and the alternating and direct current generator model duplicate items under Electricity and Cell Lab, which also carries fourteen meters. The decade resistance, capacitance and inductance boxes appear again in the testing and measuring range elsewhere on this site. Transformers, coils, electromagnets and motor kits are under Magnetism Physics Equipments.
Because so many names in this range end in a variant number rather than a specification, always order by code and always have the figures confirmed in writing against that code, and keep the confirmation with your asset records so the next order matches. One entry to query specifically: E-0010 is named as an analogue ammeter gauge and carries two different range figures in its own name, so ask which is correct. E-0047 is absent from the sequence, and "condenser box" (E-0083) uses the older word for a capacitor while other codes in the same range say capacitance, so searching the listing for one term will not find the other. Ask also for the quantity per student group, the supply voltage, frequency and plug type for your country, consumable prices in quantity, and the warranty. Any figure quoted is confirmed in writing on the quotation; ask for its basis.
Meters, galvanometers and demonstration machines with the full meter specification checklist are under Electricity and Cell Lab. Magnets, transformers and coils are under Magnetism Physics Equipments, and charge, electroscopes and the Van de Graaff generator under Electrostatic Physics Labware. Photocells and light-dependent components sit with Optics Physics Lab, and general bench apparatus under Mechanics Physics Lab. Parent range: Physics Lab Equipments.
Name the family and state the figures you need rather than quoting a variant number. For example four-millimetre stackable connecting leads, 500 mm, one hundred of each of four colours, with the conductor cross-section and current rating stated; a six-decade resistance box with the tolerance per decade and the residual resistance confirmed; rheostats of the resistance your experiments need with the current rating at full slider travel; and low-voltage bulbs with holders of a matching fitting, priced per hundred. Contact Ray Export for specifications, quantity prices and lead times.
Nothing you can specify against. Accumulators, connecting leads in each plug size, capacitors, decade boxes and inductance boxes are each listed as numbered types, and that variant number is not a specification: it does not tell you a voltage, a capacity, a length or a resistance. Name the family and ask for the figures that identify what you want, order by code, have those figures confirmed in writing against the code, and keep the confirmation with your asset records so that the next order matches the last one.
They are the one group here that needs a safety brief, so ask the chemistry first. Charging a vented lead-acid cell produces hydrogen, so charge in a ventilated place away from ignition sources, never in a closed cupboard. The electrolyte is acid: eye protection and gloves for anyone topping up or moving cells, a spill plan, and only distilled water added. Never short the terminals - a cell will deliver hundreds of amperes, weld a lead and can start a fire. For most practicals a low-voltage bench supply is the better answer; buy accumulators where the syllabus names them.
Ask before you order. Batteries are restricted cargo in most places, and the restriction depends on the chemistry, so ask how the cells are classified for carriage and whether they can be shipped to your country at all. Ask the mass too, and whether the cell is sealed, which removes most of the handling hazard - and if it is, whether it is still vented under fault conditions. Plan the end of life as well: ask what the disposal route is where you are and budget for it, because an exhausted lead-acid cell is not general waste.
A charged capacitor holds energy after the circuit is switched off. For the larger values and for the charging and discharging demonstration boards (E-0048, E-0049), make it a standing rule that a capacitor is short-circuited through a resistor and checked before anyone handles it, and that boards are put away discharged. Ask whether the boards include a bleed resistor and a discharge link, ask the working voltage of every capacitor - one used above its rating fails, sometimes energetically - and ask which are polarised, since an electrolytic connected the wrong way round is the other way they fail.
Pick one and buy only that. This range offers both, and a laboratory holding both ends up with half its leads unusable in half its sockets, so choose the size your meters and boards take. Specify stackable plugs, which let two leads share one terminal and remove the commonest reason a student circuit will not go together. Ask the length, conductor cross-section, current rating and insulation. And buy leads and bulbs in quantity with the apparatus rather than single items later, because a practical stops when the box is empty rather than when the apparatus fails.
Their own accuracy sets the accuracy of the result. For decade boxes, ask the tolerance of each decade and whether a calibration certificate is available, the power rating per decade - the low-value decades overheat first - and the residual resistance of the switches and wiring, which is the lowest value the box can present. For inductance boxes, ask the winding resistance too. For rheostats, ask whether the current rating applies at any slider position: used as a potential divider with most of the winding out of circuit, the dissipation concentrates in a short length of wire, which is how a rheostat burns out.
Ray Export is a manufacturer and exporter of laboratory, scientific and educational equipment based at Plot No. 449, HSIIDC Industrial Area, Saha, Ambala, Haryana 133104, India. Enquiries: [email protected], +91-9817319615.
Written by Palak Mall, Senior Content Writer. Technically reviewed by Arvind Kumar, Lab Equipment Specialist, 12+ years in laboratory and testing instrumentation. Last updated: 17 October 2026.
Specifications - voltages, capacities, lengths, current ratings, tolerance per decade, residual resistance and working voltages - are confirmed in writing on the quotation against each code. For calibration certificates, standards or approvals, contact us for the latest copies of the relevant certificates. No price is quoted on this page. Listing notes: most names end in a variant number rather than a specification; E-0010, named as an analogue ammeter gauge, carries two different range figures in its own name; E-0047 is absent from the sequence; condenser box (E-0083) uses the older word for capacitor, so a search for one term misses the other; and the demonstration motor, generator model and decade boxes duplicate items in other ranges under other code series.
Charged porous pot 150 x 60 mm, with the terminal having e.m.f. 1.5 volts.
Charged porous pot spare size 150 x 60 mm height x diameter, with brass screw and e.m.f. 1.5 volts. for Leclanche cell.
Ni-Cd, fast charging 6hours, operates on 220 Volt AC.
It can charge AA, AAA, C, D & 9V batteries. Ni-Cd, fast charging 6hours, operates on 220 Volt AC.
Includes: (1) 125g Roll
This is chromium wire that can be used in many applications in the classroom or lab. Its functional characteristics are the same as nichrome wire. Its makeup is 15% Cr, 4% Al, Balance Fe. Maximum operating temperature is 1150°C. Density is 6.74g/cm^3
Includes: (1) 125g Roll
This is chromium wire that can be used in many applications in the classroom or lab. Its functional characteristics are the same as nichrome wire. Its makeup is 15% Cr, 4% Al, Balance Fe. Maximum operating temperature is 1150°C. Density is 6.74g/cm^3
Note: The wire is sold by weight. The lengths are approximations based on the density, weight, and thickness of the wire.
Includes: (1) 125g Roll
This is chromium wire that can be used in many applications in the
classroom or lab. It's functional characteristics are the same as
nichrome wire. It's makeup is 15% Cr, 4% Al, Balance Fe. Maximum
operating temperature is 1150°C. Density is 6.74g/cm^3
Many industrial and hobby hot wire foam cutters also use chromium wire.
Chromium wire is also commonly used in ceramics, as an internal support
structure to help some elements of clay sculptures hold their shape
while they are still soft. Chromium wire is used because of its ability
to withstand the high temperatures.
Note: The wire is sold by weight. The lengths are approximations based on the density, weight, and thickness of the wire.
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