An email cover letter is an email that you send with your resume to introduce yourself as a candidate for a job. It is important as it the first impression that a hiring manager gets of you. Email cover letters are normally shorter than traditional cover letters and are included in the body of the email rather than as an attachment.
Firstly, look at the job description/job advertisement and ensure that the cover letter highlights in a clear and concise way, how your nursing qualifications, experience, skills and personality match the job requirements.
Show your enthusiasm for this particular nursing job and employer by explaining why you chose to apply for this job and facility.
Finally, while reading it over, ask yourself: Does this cover letter sell yourself as the best candidate for the job?