Answer:
Independent variable is the voltage and the dependent variable is the current
Step-by-step explanation:
When studying the effect of one variable over another the variable that changes with respect to the other variable is the dependent variable. The variable that does not depend on the other variable is the independent variable.
Generally while plotting a graph the independent variable is the x axis while the y axis is the dependent variable.
Here, the batteries are changed according to their voltages while the current produced is measured.
So, the independent variable is the voltage and the dependent variable is the current.