264 Answered Questions for the topic electrical engineering

Electrical Engineering Math Computer Science Mathematics

14h

A shop has 6 rows of lighting each with 42 fixtures. During a lighting retrofit it takes 2 electricians 70 minutes to change 1 fixture.

How many electricians are required to change all of the fixtures in a 40 hour time period
Electrical Engineering Physics Electromagnetism

9d

Is it possible, after increasing semiconductors‘ temperature, to make their conductivity be equal to the conductivity that of metals

Is it possible, after increasing semiconductors‘ temperature, to make their conductivity be equal to the conductivity that of metals. Why?
Electrical Engineering Calculus Physics Mechanical Engineering

22d

Can you solve this?

Mean value theoremSuppose two cars start a race at the same time and end it at the same time. Prove that at some point in time, their speeds were the same.
Electrical Engineering Computer C++ Computer Programming

27d

Why is signed char 0xff = -1?

I don't understand it very well.
Electrical Engineering Algebra 2 Calculus Sat Math

10/28/21

How to solve this math by k(x+h)-k(x)/h this formula?

Consider the piecewise functiong(x)={(1+x)4−1, if x≥0 sin(4x), if x<0.Discover whether g(x) is differentiable at x=0 using the limit definition of the derivative. Without carrying out any... more
Electrical Engineering Physics

10/14/21

A set of elements is subjected to a voltage v = 60 cos (5t + 45º) V and passed through by a current i = 3 cos (5t + 15º) A.

In sinusoidal steady state, the set of elements is represented by an impedance whose imaginary part is(A) 35Ω .(B) 25Ω .(C) 20Ω .(D) 15Ω .(E) 10Ω .
Electrical Engineering Physics

10/14/21

An alternating voltage is described by 𝑣 = 50 𝑐𝑜𝑠 𝑡 (𝑣𝑜𝑙𝑡𝑠).

The value of the stress at 𝑡=𝜋/4 (seconds) is:A) 25 √2 V.(B) 30 V.(C) 30 √2 V.(D) 30 √3 V.(E) 50 V.
Electrical Engineering Physics

10/14/21

In a three-phase, symmetrical, star-connected generator, phase sequence ABC, the phase voltage is 𝑉an=100∠40° 𝑉.

The phase voltage 𝑉cn is:(A) 100∠-80° 𝑉.(B) 100∠160° 𝑉.(C) 100∠120° 𝑉.(D) 100∠-120° 𝑉.(E) 100∠0° 𝑉.
Electrical Engineering Physics

10/14/21

A balanced three-phase system, with line voltage of 220V/60Hz, feeds a star-connected balanced three-phase load with apparent power of 3kVA and leading 0.8 power factor.

Considering the information presented, analyze the following statements.I. The current per phase in the load is 5A.II. The active power of the load is 1800W.III. The reactive power of the load is... more
Electrical Engineering Physics

10/14/21

A series RLC circuit with a resistance of 40Ω, a capacitor of 6.7mF, and an inductor of 0.20H is connected to a 127V/60Hz voltage source.

Select the alternative that presents the value of the circuit impedance.(A) Z = 40Ω - j75.0Ω .(B) Z = 40Ω + j2.51Ω .(C) Z = 40Ω + j0.251Ω .(D) Z = 40Ω + j75.0Ω .(E) Z = 40Ω + j25.1Ω .
Electrical Engineering Physics

09/21/21

What diameter wire of this material will do the job?

Design a 0.60 A fuse that "blows" if the current exceeds 0.60 A . The fuse material in your stockroom melts at a current density of 450 A/cm^2 .What diameter wire of this material will do the job?
Electrical Engineering Science Physics Physical Science

09/19/21

Physics question about resistors

You are given six resistors each of value 10 ohms, how will you connect them to give a total of 10 ohms? I need this to draw a circuit diagram of this arrangement but am unable to figure it out.
Electrical Engineering Physics Electromagnetism

09/13/21

Finding the resistance value and total

Two incandescence 50w-220v connected in series, then the two lamps are connected in parallel with incandescent lamp an 80W, 220VA ) how the obstacles total?B ) how power produced all the joint if... more
Electrical Engineering Algebra 1 Algebra 2 Calculus

08/14/21

Systems In A Park

Part A: A mistake was made in mixing the lemonade for the concession stand, but you can fix it! The lemonade comes in 100% juice concentrate, but you only serve it as 70% solution. Unfortunately,... more
Electrical Engineering

08/11/21

Energy source conversion

The power input to a motor is 10 kW and the power output is 7 kW. Determine the efficiency of the motor. Can anyone help me? And could you tell me step my step and also answer the same question... more
Electrical Engineering Math Calculus Geometry

08/09/21

Equations of Lines and Planes

If the line L is given by x= 2+ 3t , y=1- 2t , z= t, then it could also be written in symmetric form as(x-2)/6 = (y-1)/ = z/
Electrical Engineering Math Calculus Geometry

08/09/21

Vectors and the Geometry of Space

Find the distance of the point (4,6,−4) from the line r(t)=⟨−1+3t,1+3t,5−3t⟩.Answer:
Electrical Engineering Math Calculus Geometry

08/09/21

Vectors and the Geometry of Space

Find the distance from the point (-1, -4, 0) to the plane −3x −y + 3z =3
Electrical Engineering Math Calculus Geometry

08/09/21

Vectors and the Geometry of Space

Let a=(3,3,6) and b=(9,2,1) be vectors.Compute the cross product a×b.a×b = ( , , )
Electrical Engineering Physics Electromagnetism

08/08/21

Electromagnetism

Show that for a vector field that has the form E = F(r) r̂, the rotational is zero and the divergent is given by DIV(E) = 2F(r) ⁄ r + dF⁄dr
Electrical Engineering Physics Electromagnetism

08/08/21

Electromagnetism

A ring of radius R has a homogeneous charge distribution. Place the origin at the center of the ring and calculate the electrostatic field for any point r such that |r| < R.
Electrical Engineering Electrical Circuit Diode

08/03/21

10V(p-p), 1KHzsinusoidal voltage is applied to an op-amp input(inverting) and non inverting input is grounded. Draw the output wave form.

10V(p-p), 1KHzsinusoidal voltage is applied to an op-amp input(inverting) and noninverting input is grounded. Draw the output wave form.

07/13/21

I am having trouble understanding how I got these wrong on my test. Is there something I am missing with xor?

There are 2 inputs. (A and B) both are connected to an OR Gate and a NAND gate. Those gates are then connected to an XOR gate. my answer for the truth table was A B Y0 0 1 0 1 01 1 11 0 0I'm not... more

06/11/21

Evaluate the sum using the summation formulas and properties.

12 (j3 - 3j2) j = 1= ______
Electrical Engineering

06/08/21

For the circuit below, find

For the circuit below, finda) the missing voltages of element 1, 4, and 6,b) the missing currents of element 2, 3, 5, and 7, andc) determine whether each of the device is supplier or a receiver of... more

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