Avery is experimenting with a simple circuit. She measures the current in the circuit three different times with a different battery each time. First, she uses a 1.5-volt battery. Next, she uses a 3-volt battery. Last, she uses a 9-volt battery. The resistance stays the same during each test.
How does the current change for each test?
a- The current increases.
b- The current decreases.
c- The current stops.
d- The current remains the same.