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4 years ago

Select the characteristics of an ideal operational amplifier.

Engineering

1 answer:

SpyIntel [72]4 years ago

3 0

Answer:

Numbers 4, 6, & 7 are correct

Explanation:

4- this allows the op amp to have zero voltage so that maximum voltage is transferred to output load.

6- this ensures that op amp doesn't cause loading in the original circuit, high input impedance would not deter the circuit from pulling current from it.

7- high difference between upper and lower frequencies.

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WILL GIVE BRAINLIEST

ELEN [110]

Answer: Both man and trees are two most essential parts of the big whole called life. God created trees as man’s life support system. Without trees man’s life would be dreary wasteland devoid of the promise and hope of life. Omniscient God knew man’s many survival needs, hence He created a living god called tree to help man live healthily, joyously, and rapturously. Trees are the source of life. They are the giving angels. They give man oxygen, rains, wood, fruit

Explanation:

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4 years ago

A hair dryer is basically a duct of constant diameter in which a few layers of electric resistors are placed. A small fan pulls

nikitadnepr [17]

Answer:

the percent increase in the velocity of air as it flows through the dryer is 12%

Explanation:

given data

density of air ρ = 1.18 kg/m³

density of air ρ' = 1.05 kg/m³

solution

we know there is only one inlet and exit

ρ × A × v = ρ' × A × v' ........................1

put here value and we get

$\frac{v'}{v} = \frac{\rho }{\rho '}$

$\frac{v'}{v} = \frac{1.18}{1.05}$

$\frac{v'}{v}$ = 1.12

so the percent increase in the velocity of air as it flows through the dryer is 12%

4 0

4 years ago

The ice on the rear window of an automobile is defrosted by attaching a thin, transparent, film type heating element to its inne

pshichka [43]

Answer:

A)Q = 1208.33 W/m²

B)K = 0.138 W/m.K

Explanation:

We are given;

inside air temperature;T_∞,i =25 °C = 25 + 273 = 298K

outside air temperature;T_∞,o = -10°C = - 10 + 273 = 263K

Inner surface temperature;T_s,i = 15 °C = 15 + 273 = 288K

Thickness, L = 4mm = 0.004m

convection heat transfer coefficient ; hi = 25 W/(m².K)

A) From an energy balance at the inner surface and the thermal circuit, the electric power required per unit window area is given as;

Q = [(T_s,i - T_∞,o)/((L/k) + (1/hi))] - [(T_∞,o - T_s,i)/(1/hi)]

Plugging in the relevant values with k for glass as 1.4 W/m.k, we have;

Q = [(288 - 263)/((0.004/1.4) + (1/25))] - [(263 - 288)/(1/25)]

Q = 583.33 + 625

Q = 1208.33 W/m²

B) The formula for thermal conductivity is;

K = (QL)/(AΔT)

Where;

K is the thermal conductivity in W/m.K

Q is the amount of heat transferred through the material

L is the distance between the two isothermal planes

A is the area of the surface in square meters

ΔT is the difference in temperature in Kelvin

ΔT = 298K - 263K = 35K

Now, since we have value of heat per unit area to be Q = 1208.33 W/m², let's rearrange the equation to reflect that; Thus ;

k = (Q/A) x (L/ΔT)

K = 1208.33 x (0.004/35)

K = 0.138 W/m.K

5 0

3 years ago

How many paragraphs are good for an essay

zhannawk [14.2K]

Answer:

It depends what type of essay you're writing. Normally you'll want an intro, three body paragraphs and then a conclusion, but if you're writing an argumentative essay you will want an intro par, three body par, a counterclaim and rebuttal par, and a conclusion par.

Explanation:

Typically 5 or 6 paragraphs will work, really just depends what type of essay.

3 0

3 years ago

Read 2 more answers

Shane's 100-watt radio draws 7 amps of current on a 120-volt circuit. What is the resistance in the radio?

lawyer [7]

Answer:

Resistance, R = 2.04 Ohms.

Explanation:

Given the following data;

Current = 7 amps

Circuit voltage = 120 Volts

Power = 100 Watts

To find the resistance;

First of all, we would calculate the potential difference (voltage level) used by the radio.

Power = current * voltage

100 = 7 * voltage

Voltage = 100/7

Voltage = 14.29 Volts

Next, we solve for the resistance of the radio;

Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.

Mathematically, Ohm's law is given by the formula;

$V = IR$