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
Flura [38]
3 years ago
14

(i) Two 110V lamps are connected in parallel. Their ratings are 150W and 200W.

Physics
1 answer:
LekaFEV [45]3 years ago
7 0

Answer:

37.7 Ω

Explanation:

The resistance in each lamp is:

P = IV = V²/R

R = V²/P

R₁ = (110 V)² / (150 W)

R₁ = 80.67 Ω

R₂ = (110 V)² / (200 W)

R₂ = 60.5 Ω

Their combined resistance in parallel is:

1/R = 1/R₁ + 1/R₂

1/R = 1/(80.67 Ω) + 1/(60.5 Ω)

R = 34.57 Ω

So the current that goes through them is:

V = IR

I = V/R

I = (110 V) / (34.57 Ω)

I = 3.182 A

We need the same current in the new circuit.

V = IR

230 V = (3.182 A) (R₃ + 34.57 Ω)

R₃ = 37.7 Ω

We can check our answer by finding the voltage drop across this resistor:

V = I R₃

V = (3.182 A) (37.7 Ω)

V = 120 V

230 V − 120 V = 110 V, the correct voltage for the lamps.

You might be interested in
Two forces are exerted on an object in the vertical direction: a 20 N force downward and a 10 N force upward. The mass of the ob
VMariaS [17]

Answer:

They are equal.

Explanation:

6 0
3 years ago
True or False: The rock cycle is a slow process.
IrinaK [193]
<span>The rock cycle is a slow process is true </span>
8 0
3 years ago
Read 2 more answers
Which properties can be used to determine whether a substance is a liquid or a plasma? Check all that apply.
lapo4ka [179]
Plasma is the state of mater after gases. Its where the gas forms ions. The state is made of charged particles. 
So, the best test for plasma is C and D.
    The charge of the substance's particles and 
    The distance between the substance's particles. 
6 0
3 years ago
Read 2 more answers
A transformer steps up an alternating current from
Deffense [45]

Answer:

See the answers below.

Explanation:

A transformer is a static electrical machine, it should be borne in mind that although the voltage can be increased or decreased, the power must always be equal.

For this case:

The power in the first coil can be calculated by means of the following formula.

P=V*I\\

where:

V = voltage = 12 [V]

I = current =2 [A]

a)

Therefore the power:

P=12*2\\P=24[W]

b)

Now in the second coil, the power must be the same:

P_{secondcoil}=V*I\\24=144*I_{secondcoil}\\I_{secondcoil}=24/144\\I_{secondcoil}=0.166[A]

4 0
3 years ago
Why can acceleration include only a change in direction?
Fynjy0 [20]

First we shall look at some terms:

Velocity - frequency of change of an objects position.

Acceleration - frequency of change of an objects velocity


Since velocity covers both change in direction and speed, we can asume that the answer is B, not because it's the only one we worked with, but because the others don't make any sense:

A - this is not correct, because a chnage in direction can be done withough a change in speed.

C - The scientific definition of acceleration does include speed, and this is not a reasonable answer.

D - Velocity can change, unlike said in the sentence.


Hope it helped,


BioTeacher101

6 0
3 years ago
Read 2 more answers
Other questions:
  • 0.013*30A 340 g bird flying along at 6.0 m/s sees a 13 g insect heading straight toward it with a speed of 30 m/s. The bird open
    13·1 answer
  • At a stoplight, a truck traveling at 15 m/s passes a car as it starts from rest. The truck travels at constant velocity and the
    10·1 answer
  • An 80kg student running at 3.50m/s grabs a rope that is hanging vertically. How high will the student swing?
    9·1 answer
  • How far below an initial straight-line path will a projectile fall in one second
    8·1 answer
  • The closest star to our solar system is Alpha Centauri, which is 4.12 × 10^16 m away. How long would it take light from Alpha Ce
    14·1 answer
  • What is the meaningful of physics ​
    8·1 answer
  • An electroscope is a simple device consisting of a metal ball that is attached by a conductor to two thin leaves of metal foil p
    11·1 answer
  • A 110-pound person pulls herself up 4.0 feet. This took her 2.5 seconds. How much power was developed?
    11·2 answers
  • Consider a point on a bicycle wheel as the wheel turns about a fixed axis, neither speeding up nor slowing down. Compare the lin
    7·1 answer
  • What is nylon?<br>answer​
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!