What is the energy change ina a solar heater?

Which is the energy. change in galvanic cell?

We use mechanical energy in generators to move the magnet or coiled conductor continously . In that case what shall be the energy change in a generator ?

What is the energy transformation that takes place in a solar cell?

In a process, 701 J of heat is absorbed by a system and 394 J of work is done by the system. What is the change in internal energy for the process?

In a process, 701 J of heat is absorbed by a system and 394 J of work is done by the system. What is the change in internal energy for the process?