In this chapter, most examples and problems involved direct current (DC). DC circuits have the current flowing in one direction, from positive to negative. When the current was changing, it was changed linearly from I = − I max t o I = + I max and the voltage changed linearly from V = − V max to V = + V max where V max = I max R .Suppose a voltage source is placed in series with a resistor of R = 10 Ω that supplied a current that alternated as a sine wave, for example, I ( t ) = ( 3.00 A ) sin ( 2 π 4.00 s t ) . (a) What would a graph of the voltage drop across the resistor V(t) versus time look like? (b) What would a plot of V(t) versus I (t) for one period look like? (Hint: If you are not sure, try plotting V(t) versus I (t) using a spreadsheet.)
In this chapter, most examples and problems involved direct current (DC). DC circuits have the current flowing in one direction, from positive to negative. When the current was changing, it was changed linearly from I = − I max t o I = + I max and the voltage changed linearly from V = − V max to V = + V max where V max = I max R .Suppose a voltage source is placed in series with a resistor of R = 10 Ω that supplied a current that alternated as a sine wave, for example, I ( t ) = ( 3.00 A ) sin ( 2 π 4.00 s t ) . (a) What would a graph of the voltage drop across the resistor V(t) versus time look like? (b) What would a plot of V(t) versus I (t) for one period look like? (Hint: If you are not sure, try plotting V(t) versus I (t) using a spreadsheet.)
In this chapter, most examples and problems involved direct current (DC). DC circuits have the current flowing in one direction, from positive to negative. When the current was changing, it was changed linearly from
I
=
−
I
max
t
o
I
=
+
I
max
and the voltage changed linearly from
V
=
−
V
max
to
V
=
+
V
max
where
V
max
=
I
max
R
.Suppose a voltage source is placed in series with a resistor of R = 10
Ω
that supplied a current that alternated as a sine wave, for example,
I
(
t
)
=
(
3.00
A
)
sin
(
2
π
4.00
s
t
)
. (a) What would a graph of the voltage drop across the resistor V(t) versus time look like? (b) What would a plot of V(t) versus I(t) for one period look like? (Hint: If you are not sure, try plotting V(t) versus I(t) using a spreadsheet.)
!
Required information
The radius of the Moon is 1.737 Mm and the distance between Earth and the Moon is 384.5 Mm.
The intensity of the moonlight incident on her eye is 0.0220 W/m². What is the intensity incident on her retina if the
diameter of her pupil is 6.54 mm and the diameter of her eye is 1.94 cm?
W/m²
Required information
An object is placed 20.0 cm from a converging lens with focal length 15.0 cm (see the figure, not drawn to scale). A
concave mirror with focal length 10.0 cm is located 76.5 cm to the right of the lens. Light goes through the lens, reflects
from the mirror, and passes through the lens again, forming a final image.
Converging
lens
Object
Concave
mirror
15.0 cm
-20.0 cm-
10.0 cm
d cm
d = 76.5.
What is the location of the final image?
cm to the left of the lens
!
Required information
A man requires reading glasses with +2.15-D refractive power to read a book held 40.0 cm away with a relaxed eye.
Assume the glasses are 1.90 cm from his eyes.
His uncorrected near point is 1.00 m. If one of the lenses is the one for distance vision, what should the refractive power of the other
lens (for close-up vision) in his bifocals be to give him clear vision from 25.0 cm to infinity?
2.98 D
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DC Series circuits explained - The basics working principle; Author: The Engineering Mindset;https://www.youtube.com/watch?v=VV6tZ3Aqfuc;License: Standard YouTube License, CC-BY