A battery is marked 9.0V. What does this mean?
Correct answer: A. Each coulomb of charge from the battery supplies 9.0J of electrical energy to the whole circuit
- A. Each coulomb of charge from the battery supplies 9.0J of electrical energy to the whole circuit
- B. The battery supplies 9.0J to an external circuit for each coulomb of charge
- C. The potential difference across any component connected to the battery will be 9.0V
- D. There will always be 9.0V across the battery terminals
Explanation
The correct answer is Option A. A battery marked as 9.0V means it provides 9.0 joules of energy per coulomb of charge. This is the definition of voltage: the amount of energy per unit charge. Option B is misleading since the voltage applies to the entire circuit, not just the external parts. Option C is incorrect because the potential difference across components depends on circuit configuration. Option D is incorrect since the voltage across the terminals can vary due to factors like internal resistance and the load connected to the battery.
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About Electric Potential
Electric potential is the work done per unit positive charge in bringing it from infinity to a point, while potential difference compares energy change between two points. Work includes potential due to point charges, superposition of scalar potentials, equipotential surfaces, and the relation between electric field and potential.
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