In accordance with Ohm's Law, the voltage V in volts (V) is equal to the current I in amps (A) times the resistance R in ohms (Ω):

*V*_{(V)} = *I*_{(A)} *
*R*_{(Ω)}

So volts are equal to amps times ohms:

Volts = Amps * Ohms

or

V = A * Ω

Find the voltage in volts given a resistance of 25 ohms and a current of 0.2 amps.

The voltage V is equal to 0.2 amps times 25 ohms which is equal to 5 volts:

*V* = 0.2A * 25Ω = 5V

The power *P* is equal to the voltage *V* times the current *I*:

*P* = *V* * *I*

The current *I* is equal to the voltage *V* divided by the resistance
*R* (ohm's law):

*I* = *V* / *R*

So the power *P* is equal to:

*P* = *V* * *V* / *R* = *V*^{2} /
*R*

So the voltage V in volts (V) is equal to the square root of the power P in watts (W) times the resistance R in ohms (Ω):

*V*_{(V)} = √[*P*_{(W)} *
*R*_{(Ω)}]

So volts are equal to the square root of watts times ohms:

Volts = √[Watts * Ohms]

or

V = √[W * Ω]

Find the voltage V in volts given a resistance of 12.5Ω and a power of 2 watts.

The voltage V is equal to the square root of 2 watts times 12.5 ohms which is equal to 5 volts:

*V* = √[2W / 12.5Ω] = 5V

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