H2(g) and O2(g) passed into a hydrogen fuel cell. The voltage measured with an open circuit. Different resistances are added to the circuit and the voltage and current are measured for each load. The fuel cell is disconnected and replaced by a dry cell. Same procedure is used to measure the voltage and current for the same resistances in the circuit.
-The measurements are given. I plot the voltage-current graph(voltage as vertical axis), and I observe that the negative slope of the line of the dry cell is steeper, which implies as current increases, voltage decreases faster in dry cell than in fuel cell. But does that mean that fuel cells are more efficient(higher efficiency)? If so, why?(Besides, the line of the dry cell starts at a higher point, which means dry cell has a higher voltage than fuel cell for the same current.)
Thanks for teaching me!