Quick Answer: The Reversing Key, also called a commutator, reverses the direction of current in a circuit in one movement. It uses polished brass hardware, a cross-linked rocker contact and four binding posts.
Last updated: October 2026
Key Features
Polished brass hardware
Cross-linked rocker contact assembly
Four binding posts, 4mm compatible
Switches circuit polarity instantly
Technical Specifications
Specification
Value
Hardware
Polished brass
Contact mechanism
Cross-linked rocker assembly
Terminals
Four binding posts, 4mm compatible
About This Product
A reversing key lets students flip the current through a coil or meter without unplugging leads. It is used to reverse magnetic fields, to take ballistic galvanometer readings in both directions, and in bridge and induction experiments. Educational Instrument can arrange export supply of the Reversing Key |Commutator to Paraguay, Ghana, Croatia, Seychelles and Portugal.
Frequently Asked Questions
What is the Reversing Key used for in physics practicals?
It switches circuit polarity, so it is used to reverse magnetic fields, for ballistic galvanometer measurements and in bridge circuit and induction experiments.
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