To determine this you can review your state's statutes.
Example:
POWERS OF THE ATTORNEY IN FACT AND LIMITATIONS
(a) Except as otherwise limited by this section, by other applicable law, or by the durable power of attorney, the attorney in fact has full authority to perform, without prior court approval, every act authorized and specifically enumerated in the durable power of attorney.
(b) Notwithstanding the provisions of this section, an attorney in fact may not:
1. Perform duties under a contract that requires the exercise of personal services of the principal;
2. Make any affidavit as to the personal knowledge of the principal;
3. Vote in any public election on behalf of the principal;
4. Execute or revoke any will or codicil for the principal;
5. Create, amend, modify, or revoke any document or other disposition effective at the principal's death or transfer assets to an existing trust created by the principal unless expressly authorized by the power of attorney; or
6. Exercise powers and authority granted to the principal as trustee or as court-appointed fiduciary.
A financial power of attorney gives someone the authority to conduct business for you.