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Current transformers use copper windings surrounding a magnetic core to amplify the magnetic field generated by the coil.

Eventually, the current can hit high-voltage transformers, the spine of the power grid, and overwhelm their magnetic cores.

He was also one of the inventors of magnetic core memory, an efficient form of computer memory that dominated the computer industry for more than two decades.

In this production you’re seldom aware of the threatening but magnetic core of quiet that always lurks beneath the words, especially in the first crucial quarter of its uninterrupted 80 minutes.

Work at America’s research universities led to the first magnetic core random access memory, a predecessor to dynamic RAM, and to lithium ion batteries.