Question
What is an advantage of batteries with low internal resistance?
Answer Options
- A) Long life
- B) High discharge current
- C) High voltage
- D) Rapid recharge
Correct Answer: B
Explanation
A battery’s internal resistance is the resistance inherent in its chemical reaction, plates, and connections, which opposes the flow of current. When a battery with low internal resistance is connected to a load, less voltage is dropped across this internal resistance, meaning more voltage is available at the terminals to power the load.
Crucially, low internal resistance allows the battery to deliver a high discharge current (or surge current) without suffering a massive drop in terminal voltage. This is a vital characteristic for applications like operating an HF transceiver at 100 watts (which draws a high peak current) or starting a vehicle, which requires a massive surge of starting current.
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