Ham Radio General Class Practice Test

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What is an advantage of the low internal resistance of nickel-cadmium batteries?

Long life
High discharge current
High voltage
Rapid recharge

The correct answer is: High discharge current

The low internal resistance of nickel-cadmium batteries is beneficial because it allows for high discharge currents. Internal resistance in a battery impacts the flow of current; lower resistance means that the battery can deliver larger amounts of current more efficiently. This is particularly important in applications where high power is needed, such as starting engines or driving motors. The low internal resistance helps to minimize energy loss in the form of heat, thus allowing the battery to perform optimally under heavy loads without significant voltage drop. In contrast, factors like long life, high voltage, and rapid recharge times are not primarily attributes associated with low internal resistance. While nickel-cadmium batteries may feature good lifecycle longevity or recharging characteristics, it's specifically their ability to handle high discharge currents effectively that stands out due to the low internal resistance.