- #1
logearav
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Homework Statement
capacitor blocks Direct current. but how can a battery which is a source of direct current charges a capacitor.
How Does a Battery Charge a Capacitor in a Direct Current Circuit?
- Thread starter logearav
- Start date
AI Thread Summary
A capacitor initially allows current to flow from a battery in a direct current (DC) circuit until it becomes fully charged. While a capacitor blocks DC once charged, it does not impede the initial charging process. As the capacitor charges, its opposing voltage increases, eventually matching the battery voltage. When the voltages equalize, the total circuit voltage becomes zero, halting current flow. Understanding this dynamic clarifies how a battery can charge a capacitor in a DC circuit.
capacitor blocks Direct current. but how can a battery which is a source of direct current charges a capacitor.
- #2
tiny-tim
Science Advisor
Homework Helper
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hi logearav! 
a capacitor doesn't blocks direct current until it's fully charged
loosely speaking, the capacitor doesn't block current, it behaves like a battery that opposes the real battery …
as the capacitor charges up, the opposing voltage increases; when the capacitor is fully charged, the opposing voltage equals the battery voltage, so the total circuit voltage is zero and no current flows
logearav said:
a capacitor doesn't blocks direct current until it's fully charged
loosely speaking, the capacitor doesn't block current, it behaves like a battery that opposes the real battery …
as the capacitor charges up, the opposing voltage increases; when the capacitor is fully charged, the opposing voltage equals the battery voltage, so the total circuit voltage is zero and no current flows
- #3
logearav
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Thanks a lot tiny-tim. I got it now.
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19.
For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Let's declare that for the cylinder,
mass = M = 10 kg
Radius = R = 4 m
For the wall and the floor,
Friction coeff = ##\mu## = 0.5
For the hanging mass,
mass = m = 11 kg
First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on.
Force on the hanging mass
$$mg - T = ma$$
Force(Cylinder) on y
$$N_f + f_w - Mg = 0$$
Force(Cylinder) on x
$$T + f_f - N_w = Ma$$
There's also...
This problem is two parts. The first is to determine what effects are being provided by each of the elements - 1) the window panes; 2) the asphalt surface. My answer to that is
The second part of the problem is exactly why you get this affect.
And one more spoiler:
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