The area under the diagramm is the capacity from a battery and a capacitor. Q=I(A)*t(s)
How can I can get the Voltage so that I get the energy of the battery and capacitor?
The only information is the diagramm that is from a electric car with a battery and and a capacitor for acceleration. There is no more information of the exercise.

 

You cannot get the voltage. There is not enough information from that graph alone to derive the voltage.

 

You cannot get the voltage. There is not enough information from that graph alone to derive the voltage.

The energy of the battery and capacitor?
The exercise was on last exam and the diagramm was the only information of the exercise.

 

You cannot calculate the energy either. Perhaps this was a trick exam question?

 

You can calculate total charge transfer, but it isn't clear that you can determine where the charge is going or coming from as it sounds like the connection is more involved that just a battery being connected to a capacitor.