Electric Potential Due to a Point Charge

What is the electric potential due to a point charge, and how do we find it? In this video, we use the integral relationship between electric potential (voltage) and the electric field to find the electric potential of a point charge.
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This is part of my series on introductory electromagnetism, where we explore one of the fundamental forces of nature - how your phone charges and communicates with the rest of the world, why you should be afraid of the sun, and the fundamentals of electric and magnetic forces and fields, voltages,

[@user-sw3iz7sc4x]

why dont you multiply cos pi when you do dot product between E and dr? the path is from infinity to R. so the direction of electric field is opposite to path I think.. I know your answer is right but its a problem

[@inversedq2190]

Isn't that why the -ve sign is initially there