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
miv72 [106K]
3 years ago
15

An L-R-C series circuit, R = 160 Ω , L = 0.790 H , and C = 1.30×10−2 μF . The source has a voltage amplitude of 140 V and a freq

uency equal to the resonance frequency of the circuit. A)What is the power factor? B)What is the average power delivered by the source? Express your answer using two significant figures. C) The capacitor is replaced by one with a capacitance of C=3.20×10−2 μF and the source frequency is adjusted to the new resonance value. Then what is the average power delivered by the source? Express your answer using two significant figures.
Physics
1 answer:
wolverine [178]3 years ago
7 0

Answer: a) 1 b) 61 W c) 61 W

Explanation:

a) The  Power Factor (also known as cos φ), is defined by the difference in phase between current and voltage, in a RLC series circuit, and is expressed as follows:

cos φ = R / Z = R / \sqrt{(R)^{2} + (Xl -Xc)^{2} }

In resonance, XL =XC, so the circuit behaves like it were purely resistive, so Z=R.

Replacing in the expression for power factor, we have:

cos φ = R/Z = R/R = 1

This means that in resonance, current and voltage are in phase each other.

b) The average power delivered by the source, in resonance, is simply the power dissipated at the resistance R, as follows:

Pavg = V² rms / R = V₀² / √2 / R = 61 W

c) If the circuit remains in resonance, the average power , which does not depends on frequency provided this condition remains, keeps the same, i.e. , 61 W.

You might be interested in
Scientist A believes she has discovered a new procedure that is better than a procedure currently in use by physicians. She test
stepladder [879]

Answer:

B

Explanation:

3 0
3 years ago
Read 2 more answers
Electric power in a circuit is the rate at which _________.
densk [106]
It's the rate that energy is used or supplied
5 0
3 years ago
the density of gold is 19.3 g/cm3. suppose a certain gold wedding ring deplaced 0.55mL of liquid when dropped in a glass of spar
adell [148]

Answer:

19.3

Explanation:

Assuming we have to find Specific gravity of gold.

As we know that specific gravity is defined as the ratio of weight of the object and weight of the water displaced by the object

so it is given by

specific gravity = weight of the object/weight of the water displaced

now we have

weight of the object = (density)(volume)g

weight of object = (19.3)(0.55)g

now weight of the liquid displaced is given by

weight of water displaced = (1 g/cm^3)(0.55ml)g

now we have

specific gravity = (19.3×0.55)/(1×0.55)

specific gravity= 19.3

8 0
3 years ago
Canada is the country (dash)of the united States
lana66690 [7]

I believe it is north.

5 0
3 years ago
What is the <br>newton's first law of motion​
koban [17]

Answer:

Anybody which is in state of rest ,will be in rest if we don't apply any external force ...

8 0
3 years ago
Read 2 more answers
Other questions:
  • In fission reactions, how must the binding energy per nucleon vary? a. The binding energy per nucleon remains constant as atomic
    10·2 answers
  • What is a phase change? List 3 examples of a phase change.<br><br><br>HELP ASAP :3 ​
    11·1 answer
  • Heavy ions, such as alpha particles, lose kinetic energy as they travel through matter. Consider equation 31.1 or 31.2. Where do
    10·1 answer
  • A car sitting at a red light begins to accelerate at 2.0 m/s2 when the light turns green. It continues with this acceleration un
    12·1 answer
  • To review relationships among electric potential, electric potential energy, and force on a test charge
    5·1 answer
  • You are in a car going 70 km/h and another car passes you going in the opposite direction at 70 km/h. Do both cars have the same
    13·2 answers
  • Suzanne bikes 3 km to school every day. it takes her 20 minutes because she always has to stop at a traffic light. what is her a
    9·1 answer
  • Haha jk thats really funny that it doesnt let you take down questions
    5·2 answers
  • When a speeding truck hits a stationary car, the car is deformed and heat is generated. What can you say about the kinetic energ
    10·1 answer
  • During the photoelectric effect experiment, a photon is emitted with 5.73 x10-20 J of kinetic energy. If the work function of th
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!