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Chapter 25: Problem 4

Can the voltage across a battery's terminals be higher than the battery's rated voltage? Explain.

Short Answer

Expert verified
Yes, the voltage across a battery's terminals can be temporarily higher than the battery's rated voltage, particularly right after charging. This is often called 'recovery voltage'. However, this terminal voltage usually settles back down to the rated voltage after a short period.

Step by step solution

01

Understand Rated Voltage

Rated voltage of a battery is the nominal or nameplate voltage. It is the stable voltage a battery can supply when it is in the normal operation.
02

Explain Terminal Voltage

Terminal voltage of a battery is the voltage measure across the battery terminals. This could vary due to different factors, like the amount of current draw from the battery, state of charge of the battery, or internal resistance of the battery.
03

Analyse the Relation and Formulate Answer

When the battery is not delivering any current or in an open circuit (no load connected), the terminal voltage can be higher than the rated voltage. This 'overvoltage' usually happens after charging a battery and it's called recovery voltage. However, within a short period, this voltage will decrease and get back to the rated voltage. This is because the terminal voltage doesn't always exactly match the rated voltage, and it might be temporarily higher immediately after charging. Similarly, when load is applied, the higher internal resistance can also cause the terminal voltage to drop below the rated voltage.

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Most popular questions from this chapter

You company is designing a battery-based backup power source, In and your job is to assess its safety. You know that under damp or sweaty conditions, the resistance between two points of unbroken skin on the human body can be as low as \(500 \Omega\). Your product uses a \(72-\mathrm{V}\) battery whose internal resistance is \(100 \Omega .\) Is it capable of passing a fatal 100 mA (Table 24.3 ) through a damp human body?

When a \(9-\mathrm{V}\) battery is temporarily short-circuited, a \(200-\mathrm{mA}\) current flows. What's the battery's internal resistance?

If you accidentally leave your car headlights (current 5 A) on for an hour, how much energy drains from the car's \(12-\mathrm{V}\) battery?

A partially discharged car battery can be modeled as a \(9-\mathrm{V}\) emf in series with a \(0.08-\Omega\) internal resistance. Jumper cables connect this battery to a fully charged battery, modeled as a \(12-\mathrm{V}\) emf in series with a \(0.02-\Omega\) internal resistance. The cables connect \(+\) to \(+\) and \(-\) to \(-.\) What current flows through the discharged battery?

A \(47-\mathrm{k} \Omega\) resistor and a \(39-\mathrm{k} \Omega\) resistor are in parallel, and the pair is in series with a \(22-\mathrm{k} \Omega\) resistor. What's the resistance of the combination?
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