We are suppose to make a complex ckt with a 9v battry, a buzer and 2 lights. MY battery keeps heating up. Should i try a lower volate bulb?

 

The battery is too small and cannot produce enough current or the buzzer and light bulbs currents are too high.

An old fashioned buzzer or incandescent light bulb are simply a piece of wire that uses a high current.

 

Do you expect two 12V bulbs in series to light up when powered by 9V?

Bob