Are there laws to protect you when you provide in an emergency situation?

YES THERE IS IN PENNSYLVANIA

Explanation: Oddly enough, there are states that require a driver in a crash to render aid, e.g., Florida (with broad immunity fromn liability for first aid), and Pennsylvania, Vehicle Code Title 74, Ch. 37, § 3744. Duty to give information and render aid.  

"The driver of any vehicle involved in an accident resulting in injury to or death of any person ... shall render to any person injured in the accident reasonable assistance, including the making of arrangements for the carrying of the injured person to a physician, surgeon or hospital for medical or surgical treatment if it is apparent that treatment is necessary or if requested by the injured person"  

Similarly, under boating laws "(c) Duty to render aid. The operator of a watercraft involved in an accident involving injury or death shall render reasonable assistance to a person injured in the accident if the operator can reasonably do so without endangering persons or property."  

However, Pennsylvania is not one of the states giving broad immunity for "good faith" gratuitous first aid as a Good Samaritan, and in fact only grants "Good Samaritan" immunity from liability to a person holding a current certification in first aid issued by an approved course (Red Cross, American Heart Assoc, etc), and only if carrying out methods in conformity with the training provided in such course.  

Thus, it would be foolish for anyone not qualified to render first aid, with a current certification, to attempt to provide such assistance in Pennsylvania, other than non-medical care (phoning 911, stopping traffic, whatever). "Oh, maybe I can help save a life," will probably get you sued if you're not qualified under the Pennsylvanian laws.  

If you're a civilian who is not involved in the crash, you have no legal duty to provide any assistance whatsoever.

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