if you knew the current and the voltage, which one of the following formulas would you use to determine the power?
○ ( p = mv )
○ ( p = \frac{f}{a} )
○ ( p = i^{2}r )
○ ( p = iv )
○ ( pv = nrt )
○ ( p = dgh )
○ ( p = \frac{delta e}{delta t} )

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# Brief Explanations:
- $p = mv$ is the formula for momentum ($p$), where $m$ is mass and $v$ is velocity.
- $P=\frac{F}{A}$ is the formula for pressure ($P$), with $F$ as force and $A$ as area.
- $P = I^{2}R$ calculates power ($P$) using current ($I$) and resistance ($R$), but we need a formula with voltage ($V$).
- $PV=nRT$ is the ideal - gas law, relating pressure ($P$), volume ($V$), amount of substance ($n$), gas constant ($R$), and temperature ($T$).
- $P = Dgh$ gives pressure ($P$) in a fluid, where $D$ is density, $g$ is acceleration due to gravity, and $h$ is height.
- $P=\frac{\Delta E}{\Delta t}$ is the general formula for power as the rate of change of energy ($\Delta E$) over time ($\Delta t$), but we want a formula with current ($I$) and voltage ($V$).
- According to the definition of electric power, $P = IV$ (where $I$ is current and $V$ is voltage) is the correct formula when current and voltage are known.

# Answer:
$P = IV$

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