Voiced or voiceless?

Which of the two sounds produced by the woman is voiceless? What trick does this woman tell us?
What do we mean when we speak about voiceless consonants? 
Do our vocal chords move with vociless sounds? 

Surf the net and find out which consonants are voiceless and voiced in the English language? Make a list with two columns: one column for voiced and one for voiceless consonants.