Use the basic definition of the Watt: Watts = Joules / second.
If you specifically work in electricity, here are some other common equations involving power:
P = IV (current times voltage)
P = I2R (current squared times resistance)
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You multiply both sides of the equation by the denominator.
An equation is linear if the highest power of the unknown in the equation is 1for example an equation with just a variable to the power one such as x, y and so on is linear but one with x2, y2 and above is not linear
A quadratic equation has two roots. They may be similar or dissimilar. As the highest power of a quadratic equation is 2 , there are 2 roots. Similarly, in the cubic equation, the highest power is 3, so it has three equal or unequal roots. So the highest power of an equation is the answer to the no of roots of that particular equation.