Which statement best describes the practical consequence of higher internal resistance on charging?

Which statement best describes the practical consequence of higher internal resistance on charging?

• A. It increases charging efficiency.
• B. It has no effect on charging.
• C. It reduces charging efficiency, causes more heat during charging, and reduces maximum deliverable current.
• D. It only affects discharge.

Answer: (C)

Higher internal resistance means more energy is lost inside the cell as heat during charging. The current flowing into the cell meets this resistance, so a larger portion of the input power is dropped as heat rather than stored chemically. That lowers charging efficiency because not all the energy you put in ends up as stored energy. The extra voltage drop also causes more heat generation in the cell and charging circuitry, increasing thermal stress. Because the cell can’t accept as much current safely without overheating or hitting voltage limits, the maximum deliverable charging current is reduced. In short, higher internal resistance makes charging less efficient, heats the cell more, and limits how much current you can push in.

Higher internal resistance means more energy is lost inside the cell as heat during charging. The current flowing into the cell meets this resistance, so a larger portion of the input power is dropped as heat rather than stored chemically. That lowers charging efficiency because not all the energy you put in ends up as stored energy. The extra voltage drop also causes more heat generation in the cell and charging circuitry, increasing thermal stress. Because the cell can’t accept as much current safely without overheating or hitting voltage limits, the maximum deliverable charging current is reduced. In short, higher internal resistance makes charging less efficient, heats the cell more, and limits how much current you can push in.