PHYSICS HIGH SCHOOL

A series circuit contains two devices, one with a resistance of 10 ohms and one with a resistance of 4 ohms. If the generator supplies a voltage of 42 V, what is the magnitude of the current? A. 2 A B. 3 A C. 1.75 A D. 1.33 A

Answers

Answer 1
Answer: First you calculate the total resistance. Since the resistors are connected in series, the total equivalent resistance is:
Rtotal = R1 + R2 = 10 + 4 = 14 ohms

Now you calculate the electrical current with Ohm's law:
I = U/Rtotal = 42/14 = 3A

Correct answer: B. 3 A

Related Questions

A student who weighs 550 N is wearing a backpack that weighs 80 N. The student is standing still on level ground. Give your answers to the following questions in newtons. Remember, enter only the number; don't try to enter the units.a) What is the magnitude of the net force on the student?b) What is the magnitude of the contact force on the student by the backpack?c) What is the magnitude of the contact force on the student by the ground?
What happens to ocean water as it moves from Antarctica to the equator
gabo’s constructed head no. 2 investigates the sense of ______ and form implied by flat planes, in contrast to the solid mass of conventional sculpture.
Race car drivers must slow down as they make turns on the track. This is best explained by the law of inertia. Which statement best describes inertia for the car going around a turn? A) A body in motion stays in motion at the same speed. B) The speed of the car going into the turn must be conserved. C) The speed around a turn is proportional to the radius of curvature of the turn. D) A body in motion tends to continue in a straight line and requires a force to turn.
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Which one of the following types of electromagnetic radiation causes certain substances to fluoresce? A. Cosmic rays
B. Ultraviolet rays
(C. X rays)
D. Infrared waves

A virtual image produced by a lens is always

A. located in front of the lens.
(B. located in the back of the lens.)
C. smaller than the object.
D. larger than the object.

Reflecting telescopes are popular because they're

A. more durable than a refracting telescope.
B. more powerful than a refracting telescope.
C. easier to build than a refracting telescope.
(D. smaller than a refracting telescope.)

The unit for measuring the rate at which light energy is radiated from a source is the

A. lux.
B. lumen.
(C. candela.)
D. Angstrom

A magnifying glass is an example of a _______ lens.

A. plano-concave
(B. plano-convex)
C. double-concave
D. converging

my answer is in ( ) and the answers are wrong please tell me the correct answer because i dont have a clue

Answers

1. Answer;

B. ultraviolet rays

Ultraviolet rays are the type of electromagnetic radiation that causes certain substances to fluoresce.

Explanation;

  • UV light is an electromagnetic radiation present in sunlight, that is shorter in wavelength than visible light and longer than X-rays.
  • Ultraviolet radiation is undetectable by the human eye, however, when it falls on certain substances, it may cause them to fluoresce that is emit electromagnetic radiation of lower energy, such as visible light.
  • Fluorescence is a phenomenon that causes a mineral to glow within the visible spectrum when exposed to ultraviolet light.

2. Answer;

B. located in the back of the lens.

Explanation;

  • Virtual images are those images that are locations from where lights appears to have converged. Additionally, virtual images can not be reproduced on a a screen, and occur on the opposite side of the object and are always upright.
  • Virtual images are formed by the diverging or concave lenses or by placing the object inside the focal length of a converging lens. The image is located at the back of the lens.

3. Answer;

C. easier to build than a refracting telescope.

Explanation;

  • Reflecting telescopes are those telescopes that uses mirrors to focus the light while refracting telescopes uses lenses to focus the light.
  • Reflecting telescopes have many advantages over refracting telescopes. These includes, the fact that mirrors don't cause chromatic aberration and they are easier and cheaper to build large.
  • Additionally, they are  easier to mount because the back of the mirror can be used to attach to the mount.

4. Answer

C. Lumen

The unit for measuring the rate at which light energy is radiated from a source is the  Lumen.

Explanation;

  • Luminous flux is the time rate of the flow of light, or the visible energy produced from a certain light source.  It is the quantitative measure of brilliance of a light source. The unit of luminous flux is lumen (lm. 
  • Luminous intensity on the other hand is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle. Luminous intensity is measured in Candela.
  • We could say that one lumen is the luminous flux of the uniform point light source that has a luminous intensity of 1 candela.

5. Answer;

B. Plano-convex lens

A magnifying glass is an example of a plano-convex lens.  

Explanation;

  • Convex lenses are types of lenses that are thicker at the center and thinner at the edges. Plano-convex lens is a type of convex lens.
  • Plano-convex lenses are types of lenses that are positive focal length elements with one spherical surface and one flat surface.
  • These types of lenses are designed for parallel light use or simple imaging. therefore they are ideal for all purpose focusing elements.
  • Magnifying glass is a type of convex lenses and an example of plano-convex lens, that is used to produce magnified image of an object.
1) It's B. Ultraviolet rays cause substances to fluoresce.
2) It's D. The lens enlarges the image.
3) It's actually more powerful so it's B. People usually buy products based on quality than portability.
4) CORRECT
5) CORRECT

The research of social psychologist vincent hsu determined that americans tend to fulfill their ideal of self-reliance through a. rebellion against social norms.
b. strong individualism.
c. developing personal ideals.
d. conforming to role models.

Answers

I think the correct answer from the choices listed above is option C. The research of social psychologist vincent hsu determined that americans tend to fulfill their ideal of self-reliance through  developing personal ideals. Hope this answers the question. Have a nice day.

A. conforming to role models

Just toke the test

a ball is dropped from rest at a height of 80 m above the ground. what is the speed just as it hits the ground?

Answers

Δx=Vi(t)+.5at²
Δx=80
a=9.8
Vi=0 since its from rest, the initial velocity is 0.
80=0+.5(9.8)t²
t=16.33
You can use one of the big five equations: Vf=Vi+at
Vf=0+9.8(16.33)
Vf=160.034 m/s

Which of the following sources of pollution would be the most difficult to track and regulate?

Answers

lawn fertilizer runoff

Lawn fertilizer runoff can be the most difficult to track and regulate since it may have spread in the soil and was washed away together with the water particles. 


Pollution is an ecological disturbance and turmoil that ruins and endangers life either in land or sea, even air. 
Three types of pollution exist:
Water pollution
Air pollution
Land pollution 

Without wires, electronic signals can be carried over long distances bya. transistors.
b. magnetic fields.
c. electromagnetic waves.
d. integrated circuits.

Answers

The correct answer for the question that is being presented above is this one: "c. electromagnetic waves." Without wires, electronic signals can be carried over long distances by electromagnetic waves. Wireless energy transfer or wireless power is the transmission of electrical energy from a power source to an electrical load without interconnecting wires. 

Answer:

D. electromagnetic waves.

Explanation:

on my its D but yours may be C

The energy that moving objects have is called ________ energy.a. heat
b. kinetic
c. potential
d. electromagnetic

Answers

kinetic I think.......
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