Power (Joules) = the square root of the voltage squared divided by the resistance
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Yes.
Count the number of many times the graph intersects the x-axis. Each crossing point is a root of the equation.
"one quarter of a number increased by 5" is an expression. It is NOT an equation. There is, therefore, no method that can be used to determine what the number is.
Scientists used it to develop Nuclear Power
There are several equations for power. For example, the definition of power: P = work/time Specifically for electricity, the following equations are often used: P = I2R P = V2/R