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Examples of how a resistor saves battery power are considered. If you install a resistor in series with a load in a circuit, the current in the circuit will decrease. As a result, the power supplied by the power source will also decrease. It follows that the battery will discharge more slowly, and, therefore, it will work longer. Often, for many flashlights, you can reduce the brightness by connecting a resistor - this will reduce the current and slightly reduce the brightness of the LEDs, but the flashlight will work longer without recharging, since the battery will discharge more slowly. #resistor #battery # electronicsclub