For Excitation we have terms and definitions in 4 topics. The topics are Car Engine, Huntingtons Disease, MRI and Wind Energy.

External electrical energy applied to a transducer for its proper operation.
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One of the responses caused by specific neurotransmitters binding to receptors on a neuron. Excitation increases the probability that neurotransmitters will be released by the neuron.
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Delivering (inducing, transferring) energy into the "spinning" nuclei via radio-frequency pulse(s), which puts the nuclei into a higher energy state. By producing a net transverse magnetization an MRI system can observe a response from the excited system.

Using an electric current to create a magnetic field. See Electromagnet.
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