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Home / AC Circuits / Power in AC Circuits



Power in AC Circuits

Electrical power consumed by a resistance in an AC circuit is different to the power consumed by a reactance as reactances do not dissipate energy

  

In a DC circuit, the power consumed is simply the product of the DC voltage times the DC current, given in watts. However, for AC circuits with reactive components we have to calculate the consumed power differently.

Electrical power is the “rate” at which energy is being consumed in a circuit and as such all electrical and electronic components and devices have a limit to the amount of electrical power that they can safely handle. For example, a 1/4 watt resistor or a 20 watt amplifier.

Electrical power can be time-varying either as a DC quantity or as an AC quantity. The amount of power in a circuit at any instant of time is called the instantaneous power and is given by the well-known relationship of power equals volts times amps (P = V*I). So one watt (which is the rate of expending energy at one joule per second) will be equal to the volt-ampere product of one volt times one ampere.

Then the power absorbed or supplied by a circuit element is the product of the voltage, V across the element, and the current, I flowing through it. So if we had a DC circuit with a resistance of “R” ohms, the power dissipated by the resistor in watts is given by any of the following generalised formulas:

Answer:four covalent bonds

Explanation:

It’s right

Answer:

Acceleration is 2.78 m/s²

Explanation:

Since the car is from rest, initial velocity, u is zero.

from first newton's equation of motion:

[tex]{ \bf{v = u + at}} \\ [/tex]

v is final velocity

u is initial velocity

a is acceleration

t is time

70 km/h is (70 × 1000 ÷ 3600) m/s = 19.44 m/s

[tex]{ \sf{19.44 = 0 + (a \times 7)}} \\ { \sf{7a = 19.44 }} \\ { \sf{a = 2.78 \: {ms}^{ - 2} }}[/tex]

"Gamma rays" is the name that we call the shortest of all electromagnetic waves.  They're shorter than radio waves, microwaves, infrared waves, heat waves, visible light waves, ultraviolet waves, and X-rays.  They extend all the way down to waves that are as short as the distance across an atom.

Being so short, they carry lots of energy.  They can penetrate many materials, and they can damage living cells and DNA.  They're dangerous.

The sun puts out a lot of gamma radiation.  The atmosphere (air) filters out a lot of it, otherwise there couldn't even be any life on Earth.  

As soon as astronauts fly out of the atmosphere, they need a lot of shielding from gamma rays.

You know the precautions we take when we're around X-rays.  The same precautions apply around gamma rays, only a lot more so.

It's only in the past several years that we've learned how to MAKE gamma rays without blowing things up.  Also, how to control them, and how to use them for medical and industrial applications.

Explanation:

Gamma rays are ionizing electromagnetic radiation, observed by the decay of an atomic nucleus.

Uses of gamma rays :

Is there a equation or something so I can do the math of how many flowers there are at the end of the two monthsm

Answer:

Newton

it is derived of mass and displacement

Answer:

0.000621 mile

1.094 yards

3 feet 3.37 inches

39.37 inches

Answer:

1m = 0.000621371 miles = 1.09361 yards = 3.28084 feet = 39.3701 inches

Answer:

The world would have been blown up by now.

Explanation:

Hypothetically, lets say that someone gave Kim Jong boi a cup of coffee.

He gets mad at the "public servant" since it didn't contain 3 posafa43asdunds of sugar which makes him "big".

The public servant claims they added jfoaj4su38093 units of sugar, which is equivalent to 3 posafa43asdunds.

He gets mad and launches big cannons at Trump since he blames Boe Jiden.

The final volume is 4.0 liters.

We can calculate the final volume with Boyle's law:

[tex] P_{i}V_{i} = P_{f}V_{f} [/tex]  (1)

Where:

[tex] P_{i}[/tex]: is the initial pressure = 100 kPa

[tex] V_{i}[/tex]: is the initial volume = 1.0 L

[tex]P_{f}[/tex]: is the final pressure = 25 kPa

[tex]V_{f}[/tex]: is the final volume =?

Hence, the final volume is:

[tex] V_{f} = \frac{P_{i}V_{i}}{P_{f}} = \frac{100 kPa*1.0 L}{25 kPa} = 4.0 L [/tex]

Therefore, the final volume is 4.0 liters.

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Answer:

The relative mass of the proton would be 1 and that of the electron

would be about 1/1840.

Answer:

it means that the body is moving with acceleration increased of 10m in every second.

Answer:

Zero

Explanation:

The acceleration of body moving with uniform velocity is zero, because there is no change in velocity.

Answer:

S=2,P=6,D=10,F=14. The total number of electrons contained by s,p,d,f subshells is 32

Answer:

Explanation:

Givens

a = 32 feet / second

vi = 0

d = 1472 feet

t = ?

Formula

d = vi*t + 1/2 a t^2

Solution

1472 = 0*t + 1/2 * a * t^2               Multiply both sides by 2

2944 = 32 * t^2                             Divide by 32

2944/32 = t^2                

92 = t^2                                    Take the square root of both sides

sqrt(t^2) = sqrt(92)

t = 9.59 seconds

Answer:

Pressure at any particular point in a liquid is transmitted in all directions

Explanation:

Liquid A has a density of 1.27 g/mL and liquid B has a density of 0.78 g/mL. Both are poured into the same container. If the liquids do not react chemically then the liquid B which has a density of 0.78 g/m would come over the liquid because it is a lighter fluid having less density than the liquid A

It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.

formula for density

ρ = mass / volume

Liquids A and B have densities of 1.27 and 0.78 grams per milliliter, respectively. The same container receives both of them. If there is no chemical reaction between the liquids, then liquid B, which has a density of 0.78 g/m, would emerge on the top because it is a lighter fluid and has less density than liquid A.

Thus, If there is no chemical reaction between the liquids, then liquid B, which has a density of 0.78 g/ml, would emerge on the top because it is a lighter fluid and has less density than liquid A.

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Answer:

16.18 mph

Explanation:

the speed of elevators =

(783×3600)/(33×5280) =

2,818,800/174,240 = 16.18 mph

Answer:

Mass, velocity, and radius are all related when you calculate centripetal force. ... The equation shows that if you increase mass or speed, you'll need a larger force; if you decrease the radius, you're dividing by a smaller number, so you'll also need a larger force.

hope it's help you....!!!!!!

#rishu

Answer:

The bonds can shift because valence electrons are held loosely and move freely.

Explanation:

Ill put the rest of the answers in the comments

Answer:

The bonds can shift because valence electrons are held loosely and more freely.

Answer:

Step 1. Make observations.

Step 2. Form a hypothesis.

Step 3. Make a prediction.

Step 4. Perform an experiment.

Step 5. Analyze the results of the experiment.

Step 6. Draw a conclusion.

Step 7. Report your results.

Explanation:

The first step in the Scientific Method is to make objective observations. These observations are based on specific events that have already happened and can be verified by others as true or false. Step 2. Form a hypothesis.

Our observations tell us about the past or the present. As scientists, we want to be able to predict future events. We must therefore use our ability to reason.

Scientists use their knowledge of past events to develop a general principle or explanation to help predict future events. The general principle is called a hypothesis. The type of reasoning involved is called inductive reasoning (deriving a generalization from specific details).

A hypothesis should have the following characteristics:

• It should be a general principle that holds across space and time

• It should be a tentative idea

• It should agree with available observations

• It should be kept as simple as possible.

• It should be testable and potentially falsifiable. In other words, there should be a

way to show the hypothesis is false; a way to disprove the hypothesis.

Some mammals have two hind limbs would be a useless hypothesis. There is no observation that would not fit this hypothesis!

All mammals have two hind limbs is a good hypothesis. We would look throughout the world at mammals. When we find whales, which have no hind limbs, we would have shown our hypothesis to be false; we have falsified the hypothesis.

When a hypothesis involves a cause-and-effect relationship, we state our hypothesis to indicate there is no effect. A hypothesis, which asserts no effect, is called a null hypothesis. For instance, the drug Celebra does not help relieve rheumatoid arthritis.

Answer:

d

Explanation:

30 minutes = 50 km/h * 5 =250km/h

A family goes on a road trip that is 500 km long. It takes the family 2 hours and 30 minutes to complete the trip. then the family’s speed is 200 km/hr. Hence option B is correct.

Speed is a rate of change of distance with respect to time. i.e. v =dx÷dt. Speed can also be defined as distance over time i.e. speed= distance ÷ time it is denoted by v and its SI unit is m/s. it is a scalar quantity. i.e. it has only magnitude not direction. ( velocity is a vector quantity, it has both magnitude and direction. when we define velocity, we should know about its direction) Speed shows how much distance can be traveled in unit time. As speed is scalar quantity it has nothing to do with the direction. but when magnitude of speed is given and the direction as well, then we can say that a car or body is moving with this much speed at this direction(east, north, west, south).

Speed = distance/ time

Speed = 500 km/2.5hr

Speed = 200 km/hr

Hence option B is correct.

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Answer:

your answer is 0 m/s because the object is in rest

Answer:

just a example

Explanation:

Elena always rides her bicycle at a speed of 15 miles per hour. On Sunday, she goes on a 24 mile bike ride. How many hours does this ride take?

Solution

The speed of 15 miles per hour is a rate. The key words that tell us that this is a rate are "speed" and "miles per hour". We can write:

r = 15

Next, 24 miles is a distance. We have:

d = 24

Now use the d=rt equation to get

24 = 15t

To solve this, divide both sides by 15 to get

t = 24/15

Both are divisible by 3, so this fraction reduces to

t = 8/5 = 1.6

Elena's ride takes 1.6 hours.

Answer:

2.25A

Explanation:

that is the answer

Answer:

Climbing stairs and lifting objects is work in both the scientific and everyday sense—it is work done against the gravitational force. When there is work, there is a transformation of energy. The work done against the gravitational force goes into an important form of stored energy that we will explore in this section.



Figure 1. (a) The work done to lift the weight is stored in the mass-Earth system as gravitational potential energy. (b) As the weight moves downward, this gravitational potential energy is transferred to the cuckoo clock.

Let us calculate the work done in lifting an object of mass m through a height h, such as in Figure 1. If the object is lifted straight up at constant speed, then the force needed to lift it is equal to its weight mg. The work done on the mass is then W = Fd = mgh. We define this to be the gravitational potential energy (PEg) put into (or gained by) the object-Earth system. This energy is associated with the state of separation between two objects that attract each other by the gravitational force. For convenience, we refer to this as the PEg gained by the object, recognizing that this is energy stored in the gravitational field of Earth. Why do we use the word “system”? Potential energy is a property of a system rather than of a single object—due to its physical position. An object’s gravitational potential is due to its position relative to the surroundings within the Earth-object system. The force applied to the object is an external force, from outside the system. When it does positive work it increases the gravitational potential energy of the system. Because gravitational potential energy depends on relative position, we need a reference level at which to set the potential energy equal to 0. We usually choose this point to be Earth’s surface, but this point is arbitrary; what is important is the difference in gravitational potential energy, because this difference is what relates to the work done. The difference in gravitational potential energy of an object (in the Earth-object system) between two rungs of a ladder will be the same for the first two rungs as for the last two rungs.

Converting Between Potential Energy and Kinetic Energy

Gravitational potential energy may be converted to other forms of energy, such as kinetic energy. If we release the mass, gravitational force will do an amount of work equal to mgh on it, thereby increasing its kinetic energy by that same amount (by the work-energy theorem). We will find it more useful to consider just the conversion of PEg to KE without explicitly considering the intermediate step of work. (See Example 2.) This shortcut makes it is easier to solve problems using energy (if possible) rather than explicitly using forces.

More precisely, we define the change in gravitational potential energy ΔPEg to be ΔPEg = mgh, where, for simplicity, we denote the change in height by h rather than the usual Δh. Note that h is positive when the final height is greater than the initial height, and vice versa. For example, if a 0.500-kg mass hung from a cuckoo clock is raised 1.00 m, then its change in gravitational potential energy is

mgh=(0.500 kg)(9.80 m/s2)(1.00 m) =4.90 kg⋅m2/s2=4.90 Jmgh=(0.500 kg)(9.80 m/s2)(1.00 m) =4.90 kg⋅m2/s2=4.90 J

Note that the units of gravitational potential energy turn out to be joules, the same as for work and other forms of energy. As the clock runs, the mass is lowered. We can think of the mass as gradually giving up its 4.90 J of gravitational potential energy, without directly considering the force of gravity that does the

Answer: Four electrons

Explanation:

The number of electrons that can be accepted by carbon from other atoms while bonding is four. The correct option is D.

A chemical bond is what holds atoms in molecules together. Electrostatic forces between positively charged atomic nuclei and negatively charged electrons, the positions of which in space are determined by quantum mechanics, generate bonds.

Atoms form chemical bonds to strengthen their outer electron shells. The chemical bonding type maximizes the stability of the atoms that form it.

Carbon forms covalent bonds with other elements or carbon atoms. Carbon compounds are extremely diverse, with sizes ranging from one to thousands of atoms.

Because carbon has four valence electrons, it can form four covalent bonds to achieve a full outer energy level.

Thus, the correct option is D.

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Its speed is 4m/s

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Answer:

18.25 km

Explanation:

Convert 5,000 cm to km: 5,000 cm / 10000 = 0.05 km

That person walks 0.05 km per day.

You will get the answer by multiply 365 days (a year): 0.05 km x 365 = 18.25 km