It must have a medium. It must travel in empty space. Mechanical waves are waves which needs medium of propogation.
Because the Earth<span> is a sphere, the surface gets much more intense </span>sunlight<span>, hence heat, at </span>the equator<span>than at the poles.</span>
For those seeking for the answer, its a source of electrical energy.
What gas? Gas is an invisible form so I don't see how it would have a "defined structure".
Answer:
Explanation:
Given that,
The instantaneous current in the circuit is giveen by :
We need to find the rms value of the current.
The general equation of current is given by :
It means, 
We know that,
So, the rms value of current is 2.12 A.
