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Written by Palak Mall, Senior Content Writer · reviewed by Arvind Kumar, Lab Equipment Specialist, 12+ years in laboratory supply · updated 17 October 2026

Circuit lists six items for building and testing circuits in school and college physics labs: two student circuit kits, and four component boxes for capacitance and inductance work. Use the kits for first circuits with cells, bulbs and switches. Use the boxes when a circuit needs a known, switchable value of capacitance or inductance. Figures are as given in each listing.

Circuit kits for student groups

Kit	How it is built	What the listing includes
Electricity Kit	Each component sits on its own insulated panel with 4 mm sockets, and panels are joined with 4 mm stackable leads	Components for bulbs and cells, switches, electromagnets, motors and buzzers; a teacher’s manual with tasks and investigations; listed for a group of up to 12 students
Worcester Circuit Board Kit	A circuit board with battery clips built into the tray	Resistor, diodes, thin carbon sticks, copper plate, steel wool, wire and wooden disc, bulbs and extra bulbs, rheostat, switches, connector strips, and crocodile clips with leads

The two kits take different approaches. The Electricity Kit builds circuits from separate panels, so each component is placed and wired on its own. The Worcester kit works on a board, and adds materials such as steel wool, carbon sticks and a copper plate. The Electricity Kit listing asks buyers to contact the company for spare components.

Capacitance and inductance boxes

Box	What the listing specifies
Capacitance Substitution Box	12 non-polarised capacitors from 100 pF to 0.47 µF in standard preferred values, in steps of about 1:2, selected by a rotary switch; pair of 4 mm sockets; ±2 per cent tolerance, 250 V DC
Decade Capacitance Box	High-stability paper and electrolytic capacitors in parallel-connected decades, each switched 0 to 10; 4 mm sockets at the ends of the chain and each inter-decade junction; earth terminal to the metal case; panel marked with connections, maximum safe current per decade and tolerance
Decade Inductance Box	High-stability inductances in the same decade layout, switch positions and 4 mm socket arrangement, with an earth terminal and a marked top panel, in a metal case
Variable Electric Capacitor	Variable plate condenser in a metal box with two terminals, its Bakelite front panel calibrated directly from 25 pF to 500 pF, or from 50 pF to 1000 pF

The capacitance substitution box gives twelve fixed values from one switch. The decade boxes build a value digit by digit, and the variable capacitor tunes continuously across its calibrated range. The variable capacitor comes in two ranges, so state which one is needed.

Related ranges

This range is part of Electricity & Magnetism. Leads, plugs, switches, keys and lamp holders for wiring circuits are listed under Compasses and Components. Resistance boxes, rheostats and bridges are under Resistance, and meters for reading a circuit are under Meter and Radiations.

Questions buyers ask

How many students can share the Electricity Kit?
The listing gives a group of up to 12 students. It comes with a teacher’s manual that introduces each item and sets tasks and investigations.

What range does the capacitance substitution box cover?
From 100 pF to 0.47 µF in twelve steps: 100 pF, 0.001, 0.0022, 0.0047, 0.01, 0.022, 0.033, 0.047, 0.1, 0.22, 0.33 and 0.47 µF, all at ±2 per cent and 250 V DC.

Do the decade boxes show their current limits?
Yes. The top panel of each is marked with the internal connections, the maximum safe current of each decade and the overall tolerance.

What does the Worcester kit include that a basic board does not?
Steel wool, battery clips built into the tray, extra bulbs, a wooden disc, a copper plate, diodes and rolls of wire instead of mounted wire.

Request a quotation

Send the item names and quantities through the contact page, with the range wanted for the variable capacitor and the number of student groups for the kits.