Consonant /k/ 

/k/ it is a stop velar consonant. The back of the tongue stops the air that comes from the lungs completely on the soft palate. And a small explosion occurs when the obstruction is released. Vowels cords do not vibrate when producing /k/. It's 'not voiced'. The most common writing patterns are 'c', 'k', 'ck', 'cc','x', 'q', 'qu' y 'ch'. Although it has many exceptions.
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Sounds 1: 'c' /ˈkæn/ˈ (poder)    /ˈkriːm/ (crema) /ˈmʌskjəlɚ/ (muscular)    /ˌkrɑːnəˈlɑːʤɪkəl/ (cronológico)   Sounds 2: 'k' /ˈkɪŋ/ (rey) /ˈteɪkl/ (tomar)   Sounds 3: 'ck' /ˈbæk/ (espalda)   Sounds 4: 'cc' /əˈkɚ/ (ocurrir)   Sounds 5: 'x' /ˈbɑːks/ (caja)   Sounds 6: 'q' /ˈkwoɚtɚ/ (trimestre) /ˈfriːkwənt/ (frecuente)   Sounds 7: 'que' /tɛkˈniːk/ (técnica)   Sounds 8: 'ch' /tɛkˈniːk/ (técnica) /ˈkɛməstri/ (química) /ˈskuːl/ (escuela) /ˈɛkoʊ/ (eco) /ˈstʌmək/ (estómago) /ˌkrɑːnəˈlɑːʤɪkəl/ (cronológico)   Sounds 9: 'cch' /zʊˈkiːni/ (calabacín)   Sounds 10: It's not pronounced /ˈniː/ (rodilla) /ˈnoʊ/ (conocer) /ˈnaɪf/ (cuchillo) /ˈmʌsəl/ (músculo) /ɪnˈdaɪt/ (condenar)

 The English consonant /l/