How to Calculate Work Done Using Potential Difference?

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To calculate work done using potential difference, the formula W = V × Q is applied, where W is work, V is potential difference, and Q is charge. In this case, with a potential difference of 9 volts and a charge of 10 coulombs, the work required is 90 joules. Potential difference is defined as the difference in electric potential energy between two points that causes current to flow in a circuit. This concept highlights the relationship between electric potential energy and the movement of charge. Understanding these principles is essential for solving related physics problems.
JoulesVolts
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Could someone tell me how to solve this question please?

The potential difference between the two terminals on a battery is 9 volts. How much work (energy) is required to transfer 10 coulombs of charge across the terminals.
 
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What is the definition of potential difference or essentially electric potential?
 
Potential Difference : Difference in electric potential energy between two points that will cause current to flow in a closed circuit
 
JoulesVolts said:
Potential Difference : Difference in electric potential energy between two points that will cause current to flow in a closed circuit

So it can be considered as the work done in moving a charge between two points then. or V=W/Q.
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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