Which equation links current ($I$), potential difference ($V$), and electrical power ($P$)?

• Choice A: $P=V\times I$
• Choice B: $P=\frac{I}{V}$
• Choice C: $I=P\times V$
• Choice D: $V=I^2\times P$

When operating near the hydrothermal vent, the thermoelectric generator produces a potential difference of $24V$. The electrical power output of the generator is $14.4W$. Calculate the current generated by the thermoelectric generator.

Which equation links efficiency, total power input, and useful power output?

• Choice A: $Efficiency=\frac{total\; power\; input}{useful\; power\; output}$
• Choice B: $Efficiency=useful\; power\; output\times total\; power\; input$
• Choice C: $Efficiency=\frac{useful\; power\; output}{total\; power\; input}$

The acoustic beacon has a total electrical power input of $6.5W$. The efficiency of the beacon in converting electrical power to acoustic signal power is $0.72$. Calculate the useful acoustic power output of the beacon.