They can be compared with unvoiced consonants.
Example
Voiced consonants include:
/b/ as in 'bed' /d/ as in 'dip' /g/ as in 'good' /ð/ as in 'the'
In the classroom
Voicing is a useful way to show learners the difference between the sounds in some minimal pairs, for example 'bet' and 'pet'. Teachers ask learners to say 'p' and then 'b' with a hand on their throat to feel the difference in vibration.
Further links:
https://www.teachingenglish.org.uk/article/voiced-unvoiced-consonants
https://www.teachingenglish.org.uk/article/phonemic-chart
https://www.teachingenglish.org.uk/article/integrating-pronunciation-classroom-activities