Right usage of word “Galvanize”?

Question

Please consider below meaning of dictionary

Galvanize: shock or excite (someone), typically into taking action

What is the right usage of this word? Please consider below sentences

A sudden sound in the doorway galvanized her.
He was galvanized to see a column of smoke.

Is this right usage? or do I need to use differently?

I have been observed that startle also perfectly suits here? Does it always acceptable to replace startle with galvanize?

Answer 1

Galvanize is more about being spurred to action. That drive can take many forms- startled, surprised, horrified, excited, and more - but it's the action that's important. So, taking your two examples, you would need to add something more to make galvanize fit.

A sudden sound in the doorway galvanized her into diving for cover.

He was galvanized into running for the fire extinguisher when he saw the column of smoke.

The examples are a little contrived/awkward, but hopefully illustrate the point.

You can use galvanized without expressly stating the action, but there has to be sufficient context for the reader to understand just what they were galvanized into doing.

The attack on 9/11 galvanized the nation.

Startled is just being startled, with or without any resulting action, so that fits just fine into both of your examples.

Answer 2

The origin of the word galvanize lies in the work of Luigi Galvani who demonstrated that the application of electricity to a muscle would cause movement. So to be galvanized is much more than to be surprised or startled, it is to respond to the stimulus.

Unless there is an action involved, your subject has not been galvanized.

(Be aware also that the alternative industrial meaning -- being coated with zinc -- is not relevant here.)