NOTE: I'm not requesting a solution to this problem; rather, I'm seeking clarification on an objection that arose throughout the process of solving it.
In order to refresh my understanding of AC and waves, I was attempting to answer some conceptual problems. Then, I encounter this problem :
It takes hours for a direct current to charge a storage battery. How long will it take to charge such a battery from the mains using a half-wave rectifier, if the effective current value is also equal to ? (effective current = Rms value of current)
When I looked for a solution, I got this one:
[ https://www.youtube.com/watch?v=uTR4fQOXWC4 ]
The speaker in the video says:
'so when we say 'To charge a Battery' , "BATTERY HOLDS CHARGE" , so we will equate the Total charge stored in the battery to solve the problem'
The phrase "Battery holds charge" was utilised in the solution key to answer this question.
But What we should be equating in both cases is the energy needed/consumed to charge the battery rather than the charge stored, according to what I was taught. A battery stores energy in the form of EMF rather than a physical charge.
How does the "charge stored" idea work, and can we replace it with the "energy consumed" idea? What is the concept behind it ?
A response that could explain all this to me and clear my thoughts would be greatly appreciated !!!