Question

Power and energy are scalar quantity or vector quantity?

Answer 1

Power is a scalar quantity.

Power = work done per unit time. Since work is a scalar quantity, power is also a scalar quantity.

Also, Power = F. dx/dt = F.v; where Force & velocity are vector quantities. Dot product of two vector quantities is scalar. Therefore, Power is Scalar.

we can say that energy consumed is equal to the work done.
Energy = Work= F*s, here both the force and the time is vector quantity. And we know that the product of two vector quantities give the scalar quantity. So we can say that energy is a scalar quantity.