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4 years ago

A one-family dwelling contains an electric range rated at 25 kw. what is the neutral load demand for this range

2 answers:

7 0

In the load calculations stipulated in Article 220 of the National Electrical Code, branch circuits must not be undersized for safety purposes. In industrial applications, there are always 'rule of thumbs'. The exact calculations are a product of ideal conditions. But in reality, there are heat losses through the conductor materials. Therefore, it is mandatory that a safety factor should be incorporated. For the calculation of the neutral load, it is a rule of thumb to apply a demand factor of 70% for household electrical appliances like the oven, dryers and cooking ranges. Therefore, the minimum neutral demand load for this range is 25 kW * 0.7 = 17.5 kW.

Harrizon [31]4 years ago

7 0

right answer 13.2kW. or 13200VA,

after 12kW, 5% times one additional kW. 13kWx5%=0.65

220.55 table 1 appliance column C 8kW

8x1.65=13.2kW or 13200VA

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Two long parallel wires separated by 4.0 mm each carry a current of 24 A. These two currents are in the same direction. What is

lesya [120]

Answer:

Explanation:

Magnetic field at a a point R distance away

B = μ₀ / 4π X 2I / R where I is current

Magnetic field due to one current

= 10⁻⁷ x 2 x 24 / 1 x 10⁻³

48 x 10⁻⁴ T

Magnetic field due to other current

= 10⁻⁷ x 2 x 24 / 3x 10⁻³

16 x 10⁻⁴ T

Total magnetic field , as they act in opposite direction, is

= (48 - 16 ) x 10⁻⁴

32 x 10⁻⁴ T .

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3 years ago

At the instant the traffic light turns green, an automobile starts with a constant acceleration a of 2.70 m/s2. At the same inst

kifflom [539]

Answer:

66.85 m

Explanation:

We are given that

Acceleration ,a= $2.7m/s^2$

Speed of truck, v=9.5 m/s

We have to find the distance beyond which the traffic signal will the automobile overtake the truck.

Initial speed of automobile, u=0

We know that

$s=ut+\frac{1}{2}at^2$

Using the formula

$s=0+\frac{1}{2}(27)t^2=\frac{27}{2}t^2$

For constant speed

Acceleration, a=0

Again

$s=vt+0=9.5t$

$9.5t=\frac{27}{2}t^2$

$t=\frac{9.5\times 2}{2.7}=7.037s$

Substitute the value of t

$x=9.5(7.037)=66.85m$

Hence, the distance beyond which the traffic signal will the automobile overtake the truck=66.85 m

3 0

3 years ago

Lava from a volcano becomes solid as a result of

Norma-Jean [14]

Answer:

B. heating.

Explanation:

7 0

3 years ago

Read 2 more answers

What is a car’s acceleration if it increases its speed from 5 m/s to 20 m/s in 3 s? 10 m/s2 –15 m/s2 15 m/s2 5 m/s2

Vesna [10]

Answer:

5 m/s²

Explanation:

Acceleration = change in speed/time taken

20-5=15

15/3= 5 m/s²

6 0

2 years ago

if a ball is thrown horizontally from the first floor of a building (5.0 m from the ground) at a speed of 5.0 m/s, where will it

r-ruslan [8.4K]

The ball will be 49.5m from the base when it hits the ground based on 9.8m/s² earth gravity.

what is earth gravity?
Gravity is the force by which a planet or other body draws objects toward its center. The force of gravity keeps all of the planets in orbit around the sun.

Why do things fall down when you throw them or drop them? The answer is because gravity ; an invisible force that pulls objects toward each other. Earth's gravity is what keeps you on the ground and what makes things fall.

First, let's try to find the time taken by ball to reach the ground :

$-h = 0 - \frac{1}{2}gt^{2}$

t = $\sqrt{2gh}$

t = $\sqrt{2*9.8*5$

t = 9.9 s (rounded)

Next, we will find the horizontal distance covered by ball :
D = v*t
D = 5 * 9.9

D = 49.5m

Therefore, the ball will be 49.5m from the base when it hits the ground for the first time based on 9.8m/s² earth gravity.

Learn more about earth gravity brainly.com/question/11174601

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8 0

1 year ago