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4 years ago

Kirchoff's Law states that, by the time current has returned to its source, all

Engineering

2 answers:

Alchen [17]4 years ago

6 0

Kirchoff's law states that by the time current has reached to its source all voltage must be used.

<u>Explanation:</u>

Kirchoff's voltage law states that the algebraic sum of all the voltages across a closed loop is zero. As the circuit is a closed conducting path, no energy is lost. ices All the voltage that is supplied from the voltage source is dropped at the devices in the circuit.

The potential difference maintained by the voltage source enables the flow of current across the circuit. As the supplied voltage drops at each elements of the circuit, all voltage is used by the time current has returned to the surface.

Alex17521 [72]4 years ago

4 0

Kirchoff's Law Kirchoff's Law states that, by the time current has returned to its source is explained in the following.

Explanation:

Kirchhoff's Current Law (KCL) is Kirchhoff's first law that deals with the conservation of charge entering and leaving a junction. ... In other words the algebraic sum of ALL the currents entering and leaving a junction must be equal to zero.

Kirchoff's laws apply for a given instant in time. So the voltages at a given moment around a loop will all sum to zero, or currents in a node sum to zero if you look at the instantaneous voltage and current. But they will be out of phase.

Kirchhoff Voltage Law states that ''The algebraic sum of all voltages (source voltage and voltage drops) is equal to zero around a close path''. This is called KVL ( Kirchhoff Voltage Law) equation. The source voltage is equal to the sum of all voltage drops.

Kirchhoff's Voltage Law (KVL) is Kirchhoff's second law that deals with the conservation of energy around a closed circuit path.

Kirchhoff's laws can be used to determine the values of unknown values like current, Voltage in the circuit. These laws can be applied on any circuit (with some limitation), and useful to find the unknown values in complex circuits and networks.

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Plaster Mix Ratio
Mix cement and sand in the ratio of 1:6 (1 cement:6 sand) for inner plastering of bricks. And for outer plastering mix it in the ratio of 1:4. On a brick wall never do plastering of thickness more than 12 or 15mm. At one go, avoid plastering of more than 12mm thickness.

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3 years ago

Why was Copernicus’s heliocentric model not believed until Galileo and Kepler provided more evidence?

Anna [14]

Answer:

The model was against religous teachings.

Explanation:

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3 years ago

Estimate the heating energy requirements for a residential building using the degree-day method (a) in Denver, Colorado, and (b)

Lostsunrise [7]

Answer:

a) 600°F days

b) 103°F days

Explanation:

Given data :

overall heat loss coefficient = 400 Btu/h.oF

Furnace efficiency = 0.78

applying the degree- day method the heating energy requirement per day can be obtained by subtracting the average temperature for a particular day from the acceptable mid/balance point temperature

lets assume the mid/balance point temperature = 65°F

a) heating energy requirement in Denver Colorado

we will have 600°F days ; considering the the average temperature - balance point temperature

= 665 - 65 = 600°F

b) heating energy requirement in Little Rock Arkansas

we will have 103° days

5 0

3 years ago

"A three-phase, 60-Hz, 4-pole, 440-V (line-line, rms) induction-motor drive has a full-load (rated) speed of 1750 rpm. The rated

sladkih [1.3K]

Answer:

A) slip(s1) = (1800 - 1750) / 1800 = 0.0277

B) 1800 rpm, 1350 rpm, 900 rpm, 450 rpm

Explanation:

Given data

frequency = 60 Hz,

Line - line rms = 440 - V

3 phase induction-motor drive

number of poles = 4

Full-load rated speed = 1750

rated torque = 40 Nm

A) The plot of torque-speed characteristics for the following values of the frequency f : 60 Hz, 45 Hz, 30 Hz, and 15 Hz is attached below

first we calculate the rated speed:

Ns = $\frac{120f}{p}$

f = 60 Hz . p (number of poles) = 4

Ns $_{1}$ = $\frac{120(60)}{4}$ = 1800

full loaded rated value = 1750.

slip(s1) = (1800 - 1750) / 1800 = 0.0277

considering a linearly condition the slip is low

$\frac{T1}{T2} = \frac{S1}{S2} * \frac{F2}{F1}$

S1 = 0.0277

f1 = 60 Hz

hence s2 = 0.018 therefore Ns2 = 1500

B) The speeds of operation at : 60 Hz, 45 Hz, 30 Hz, 15 Hz

for 60 Hz :

Ns = $\frac{120f}{p}$ = (120*60) / 4 = 1800 rpm

for 45 Hz:

Ns = 120(f) / p = (120*45) / 4 = 5400 /4 = 1350 rpm

for 30 Hz:

Ns = 120(f) / p = (120*30) / 4 = 3600 / 4 = 900 rpm

for 15 Hz:

Ns = 120(f) / p = (120*15) / 4 = 1800 / 4 = 450 rpm

4 0

4 years ago

The A/C system refrigerant charge amount needs to be determined on a late-model vehicle. Technician A says that the emissions la

suter [353]

Technician A is correct when he says that the emissions label contains the refrigerant charge amount while Technician B is wrong.

<h3>What is emission label?</h3>

An emissions label is known to be a kind of sticker that is often used by EPA to have manufacturers show that their non-road engines meet the needed emission requirements.

In terms of AC system, they are found under the hood of the AC unit and as such, Technician A is correct when he says that the emissions label contains the refrigerant charge amount while Technician B is wrong.

Learn more about refrigerant charge from

brainly.com/question/12823745

#SPJ1

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2 years ago