Quick Answer: The Two Way Plug Key is a plug-type switch with three brass blocks and tapered brass plugs, so a circuit can be routed down either of two paths. The polished brass hardware sits on an insulated base.
Last updated: October 2026
Key Features
Three brass blocks for two independent or combined circuit paths
Tapered brass plugs with insulated handles
Polished brass hardware on an insulated base
Low contact resistance when a plug is seated
Technical Specifications
Specification
Value
Hardware
Polished brass on insulated base
Plugs
Tapered brass, insulated handles
Blocks
Three, for dual-path branching
About This Product
With a two way key, one supply or galvanometer can be switched between two branches of a circuit by moving a plug. It is commonly used in potentiometer practicals to compare the emf of two cells, and in bridge and multi-path resistance experiments. Educational Instrument can dispatch the Two Way Plug Key to laboratories in Namibia, Sierra Leone, Turkey, Mauritius, Grenada and Gambia.
Frequently Asked Questions
Why does the Two Way Plug Key have three brass blocks?
The centre block is common to both paths, so inserting a plug on one side or the other connects the circuit to either branch, or both plugs join all three.
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