1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
love history [14]
2 years ago
11

Keiko builds a transformer in the lab, but it does not decrease the voltage as much as she needs. What should Keiko change to fu

rther reduce the voltage? A. She should make the number of coils in the primary winding less than in the secondary winding.
B. She should make the number of coils in the primary winding the same as in the secondary winding.
C. She should increase the number of coils in the secondary winding.
D. She should increase the number of coils in the primary winding.
Physics
2 answers:
LenaWriter [7]2 years ago
7 0

<u>Answer</u>

D. She should increase the number of coils in the primary winding.


<u>Explanation</u>

A transformer is a device that is used to step down or step up a the voltage.

It has two coils, primary and secondary that are used to determine how much the voltage changes.

To decrease the voltage the ratio of number of coils in the primary to the number of coils in the secondary should be big.

To reduce the voltage, D. She should increase the number of coils in the primary winding.

likoan [24]2 years ago
5 0
<h2>Answer:</h2>

The correct answer is option D which is she should increase the number of coils in the primary winding.

<h3>Explanation:</h3>

A transformer is an electrical apparatus that transfers electrical energy from one electrical circuit to another through mutual electromagnetic induction.

The main purpose of transformer is to increase or decrease (alternating current (AC)) voltage in circuits.

In its structure there are 2 coils:

  • Primary coil
  • Secondary coil.

For decreasing voltage, ration of number of turns in coil of primary to secondary coil should big.

So to further reduce the voltage, she should increase the number of coils in the primary winding.


You might be interested in
A car goes round a curve of radius 48m, the road is banked at an angle of 15 with the horizontal,at what maximum speed may the c
Marizza181 [45]

Answer:

11 m/s

Explanation:

Draw a free body diagram.  There are two forces acting on the car:

Weigh force mg pulling down

Normal force N pushing perpendicular to the incline

Sum the forces in the +y direction:

∑F = ma

N cos θ − mg = 0

N = mg / cos θ

Sum the forces in the radial (+x) direction:

∑F = ma

N sin θ = m v² / r

Substitute and solve for v:

(mg / cos θ) sin θ = m v² / r

g tan θ = v² / r

v = √(gr tan θ)

Plug in values:

v = √(9.8 m/s² × 48 m × tan 15°)

v = 11.2 m/s

Rounded to 2 significant figures, the maximum speed is 11 m/s.

3 0
3 years ago
A thin Nichrome wire connected to an ammeter surrounds a region of time-varying magnetic flux, and the ammeter reads 13 amperes.
Semenov [28]

Answer:

The current would be same in both situation.

Explanation:

Given that,

Current I = 13 A

Number of turns = 23

We need to calculate the induced emf

Using formula of induced emf is

\epsilon=NA\dfrac{dB}{dt}

For N = 1

\epsilon=A\dfrac{dB}{dt}

We need to calculate the current

Using formula of current

i=\dfrac{\epsilon}{R}

Put the value of emf

i=\dfrac{A\dfrac{dB}{dt}}{R}

Now, if the number of turn is 22 , then induced emf would be

\epsilon'=NA\dfrac{dB}{dt}

Then the current would be

i'=\dfrac{\epsilon'}{NR}

i'=\dfrac{NA\dfrac{dB}{dt}}{NR}

i'=\dfrac{A\dfrac{dB}{dt}}{R}

i'=i

Hence, The current would be same in both situation.

4 0
3 years ago
Figure 1 shows the motion of three balls. The curved paths followed by balls B and Care examples of
nlexa [21]

Answer:

in brainly app there is an option that you can upload graph, plot or diagram related to your question. you can use that app to show diagram related to your question so that one can answer your question in better way

7 0
2 years ago
Spidermans nemesis electro delivers 4kj of electrical energy in half a second how much power does it draw from the mains?
Elodia [21]

Power delivered = (energy delivered) / (time to deliver the energy)

Power delivered = (4,000 J) / (0.5 sec)

Power delivered = 8,000 watts

I'm a little surprised to learn that Electro draws his power from the mains.  This is VERY good news for Spiderman !  It means that Spiderman can always avoid tangling with Electro ... all he has to do is stay farther away from Electro than the length of Electro's extension cord.

But OK.  Let's assume that Electro draws it all from the mains.  Then inevitably, there must be some loss in Electro's conversion process, between the outlet and his fingertips (or wherever he shoots his bolts from).

The efficiency of Electro's internal process is

<em>(power he shoots out) / (power he draws from the mains) </em>.

So, if he delivers energy toward his target at the rate of 8,000 watts, he must draw power from the mains at the rate of

<em>(8,000 watts) / (his internal efficiency) .  </em>

4 0
3 years ago
Read 2 more answers
Does the atmosphere contain 21% nitrogen in 78% oxygen
Alex777 [14]

Answer:

An atmosphere is the layers of gases surrounding a planet or other celestial body. Earth's atmosphere is composed of about 78% nitrogen, 21% oxygen, and one percent other gases

7 0
2 years ago
Other questions:
  • Incident energy is defined as the amount of thermal energy impressed on a surface, at a certain distance from the source, genera
    9·1 answer
  • You are trying to determine the specific gravity of a solid object that floats in water. If m is the mass of your object, mS is
    14·1 answer
  • A rock falls off a cliff and falls for 3 secs. How high was the cliff?
    7·1 answer
  • A fatigue test was conducted in which the mean stress was 50 MPa (7250 psi) and the stress amplitude was 225 MPa (32,625 psi).
    13·1 answer
  • Austin and his friends are pushing a heavy box up a ramp. How can they increase the rate at which the box is moving?
    9·1 answer
  • A rifle of mass 2 kg is horizontally suspended by a pair of strings so that recoil can be measured. The rifle fires a bullet of
    14·1 answer
  • Which of the following correctly describes a longitudinal wave?
    14·1 answer
  • An object moves in a direction parallel to its length with a velocity that approaches the velocity of light. The length of this
    9·1 answer
  • I need the answer please help
    15·2 answers
  • Assume that the ammeter in the figure below is removed and the current that flows through the 4.0Ω path, I3, is unknown. Determi
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!