If a 1.5 V battery is removed and replaced by a 3 V battery in a circuit, the current in the circuit will likely increase. This is because the voltage supplied by the 3 V battery is higher than the voltage supplied by the 1.5 V battery, which means there is a greater potential difference across the circuit. According to Ohm's law (I = V/R), an increase in voltage will result in an increase in current as long as the resistance in the circuit remains constant. Therefore, the current in the circuit will increase when the 3 V battery is used instead of the 1.5 V battery.
