Question

identify three checks on the power of the president

Answer 1

some include impeachment, the veto override, approval of departmental appointments, declaration of war by congress, and congress' power to approve the federal budget proposed by the president.
Whichever three you choose, make sure you know what they mean ... here's a good website with brief explanations.
http://www.ehow.com/facts_5715315_checks-placed-president_.html