Scalar product is the product of magnitude of two vectors and cosine of angle θ between them
P × Q = PQ cosƟ
If P = Pxî + Pyĵ + Pzk̂ and Q = Qxî + Qyĵ + Qzk̂
Then P ×Q = PxQz + PyQy + PzQz …….. dot product
From the above equation we know that Power is a Scalar Quantity as it is a scalar product of two Vector Quantities.