What happens to the current when another cell is added in a circuit with one cell and one bulb with a current of 0.2A?

When a second cell is added in series with the first cell in a circuit, the total voltage of the circuit increases. This increase in voltage typically results in an increase in the current flowing through the circuit, assuming the resistance of the circuit remains the same.

In this scenario, the initial current in the circuit with one cell is 0.2 A. When a second cell is added, the voltage doubles if both cells are identical, which generally leads to a proportional increase in current according to Ohm's law (V = I × R). Given that the resistance stays constant, an increase in voltage will indeed result in a higher current.

If we assume that the original current was 0.2 A with a certain voltage (V) and resistance (R), doubling the voltage to 2V would theoretically yield twice the current, resulting in 0.4 A, validating the answer that the current would now be 0.4 A when a second cell is introduced.

This concept highlights the relationship between voltage, current, and resistance in electrical circuits, which is fundamental in understanding how circuits operate with multiple power sources.