When are cells connected in parallel typically used?

Cells connected in parallel are typically used to provide a strong current when external resistance is low. When batteries or cells are arranged in parallel, their voltages remain the same as a single cell, but the current capacity increases. This is particularly advantageous in applications where the demand for current is high, such as in power tools or electric vehicles. The combined output allows the system to deliver more current to a load without overheating or damaging the cells, which is crucial when the resistance in the external circuit is low.

This setup effectively ensures that multiple cells share the load, reducing the risk of individual cells being overdrawn. In contrast, connecting cells in series would increase the voltage, not the current capacity, which wouldn’t be ideal in situations where a strong current is necessary. Thus, the parallel configuration is specifically designed to meet high current demands efficiently.