The transformer can, for example, be a power transformer, an audio frequency signal coupling transformer, or part of a filter circuit where it may be that frequency variations or other causes can reduce {HEAD ~ the load} presented by {TAIL ~ the output} to the input to a value which adversely affects safety 
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The transformer can , for example , be a power transformer , an audio frequency signal coupling transformer , or part of a filter circuit where it may be that frequency variations or other causes can reduce { HEAD ~ the load } presented by { TAIL ~ the output } to the input to a value which adversely affects safety
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