Well basically in physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant, it is said to be conserved over time. This law means that energy can neither be created nor destroyed, it can only be transformed or transferred from one form to another.
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Answer:
55 mA
Explanation:
Ohm's law states:
V = IR
where V is voltage, I is current, and R is resistance.
220 V = I (4000 Ω)
I = 0.055 A
I = 55 mA
Answer:
Explanation:
We know that for a capacitor 
, where <em>Q </em>is the charge of one plate, <em>C</em> the capacitance and <em>V</em> the potential between the plates.
We also know that 
, since 
is the surface charge density and <em>A</em> the area of the plate (both equal in our case).
Putting all together:
Which for our values is:
Where we notice that the S.I. units combination FV/C must not have units (we can verify it directly from their definitions or we notice that 
is enough to describe an area).
