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.

Question

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 remains the same.
b
The current stops.
c
The current decreases.
d
The current increases.

Answer 1

d. The current increases.

According to Ohm's Law (V=IR), current (I) is directly proportional to voltage (V) when resistance (R) is kept constant. Therefore, as the voltage increases from 1.5 volts to 3 volts to 9 volts, the current in the circuit will also increase.