Unvoiced consonants are consonant sounds that are made without vibrating the vocal chords. They can be compared with voiced consonants.

Example
Unvoiced consonants include:
/p/ as in 'pet' /t/ as in 'top' /k/ as in 'cat'

In the classroom
One way to show learners the difference between voiced and unvoiced consonants is asking them to say contrasting sounds in minimal pair words, for example 'sip' and 'zip'.