"US President George W Bush is expected to set out plans to help millions of homeowners with sub-prime mortgages avoid defaulting.
Sub-prime mortgages are higher risk loans offered to people with poor credit ratings or on low incomes.
Mr Bernanke said that global financial losses in the credit market had "far exceeded even the most pessimistic projections".
And he insisted it was not the job of the Fed "to protect lenders or investors from the consequences of their financial decisions".
But he added: "The Fed stands ready to take additional actions as needed to provide liquidity and promote the orderly functioning of the markets."
Wall Street shares clung to their early gains with the Dow Jones index and Nasdaq both adding about 0.8% in mid-morning trading as investors looked ahead to President Bush's speech.
The Fed will next meet to set rates on 18 September.
Loan guarantees
Rising numbers of defaults on such loans have hit banks, which have bought debt that include these loans.
Worries about defaults have roiled stock markets and investors around the world, and raised the cost of borrowing worldwide.
Reports suggest President Bush will call for Congress to support his plans to allow the government-backed mortgage insurer - the Federal Housing Administration - to guarantee loans for borrowers who are more than 90 days behind with their payments."
http://news.bbc.co.uk/2/hi/business/6971746.stmSo banks make stupid business decisions, like giving mortgages to unreliable people with 0% deposits, and the financially wise people have their hard-earned money stolen from them to bail out the freaking bank? The commification of the US continues unabated.