Voiced [h]? Difference between vowel and consonant?

In it's writing system, my conlang, Glörsa, has two tables giving its
consonants, one voiced and one unvoiced. In the unvoiced table is the
unvoiced glottal fricative, [h]. The table of voiced consonants has a
voiced equivalent, which I've been transcribing as w. Phonetically, I've
been thinking of this sound as the open-mid back rounded vowel, [V]. But
looking at the IPA charts, I found that there is, in fact, a voiced
glottal fricative, [h\]. So: what is the difference in pronounciation
between [V] and [h\]?

And just out of curiosity, what is the technical difference between a
vowel and a consonant? Is it just a difference in how syllables are
constructed, to where a vowel and consonant can actually have the same
sound but get used (and therefore classed) differently?

Gregory Gadow

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