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3 years ago

Describe Ohm's law and its limitations;

1 answer:

5 0

The Ohm's Law is a powerful and simple tool to analyze electric circuits. It shows the relationship between voltage (V) and current (I) in a conductor. But, in order to properly apply to circuits (real circuits), its limitations must be understood. Most conductors, resistance is greatly unaffected by current or voltage (resistance is stable property).
Limitation: this law does not apply to rectifiers or semiconductors or to the conduction of electricity through gases.
Formula: current (I) is equal to voltage (V) over resistance (R)

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Help needed for science homework

Gemiola [76]

The answer is 1/2 * base * height

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3 years ago

Please help! Will give brainly, 50 points!! I don't understand! I just need this to give me a boost on my other questions.

harina [27]

Answer:

The answer to your question is: c = 353 mi/h; Ф = 7.3°

Explanation:

You can see the picture below

To solve this problem, just imagine a right rectangle which the legs is 350 mi/h and 45 mi/h and we are going to find the hypotenuse.

c² = a² + b²

c² = 350² + 45²

c² = 122500 + 2025

c² = 124525

c = 352.9 ≈ 353 mi/h

tanФ = 45/ 350

tan Ф = 0.12

Ф = 7.3°

8 0

4 years ago

Why do you think compound machines are sometimes called complex machines

Maksim231197 [3]

Answer:

i think maybe because it has more than 6 or 5 parts.

3 0

4 years ago

1. A heat engine operates between two reservoirs at T2 = 600 K and T1 = 350 K. It takes in 1.00 x 103 J of energy from the highe

Alex73 [517]

Answer:

$\Delta S_u=2.1429\ J.K^{-1}$

$W_c=416.67\ J$

Explanation:

Given:

temperature of source reservoir, $T_H=600\ K$

temperature of sink reservoir, $T_L=350\ K$

energy absorbed from the source, $Q_{in}=1000\ J$

work done, $W=250\ J$

Now change in entropy of the surrounding:

$\Delta S_u=\frac{dQ_L}{T_L}$

Since heat engine is a device that absorbs heat from a high temperature reservoir and does some work giving out heat in the universe as the byproduct.

$\Delta S_u=\frac{Q_H-W}{T_L}$

$\Delta S_u=\frac{1000-250}{350}$

$\Delta S_u=2.1429\ J.K^{-1}$

We know Carnot efficiency is given as:

$\eta_c=1-\frac{T_L}{T_H}$

$\eta_c=1-\frac{350}{600}$

$\eta_c=0.4167$

Now the Carnot work done:

$W_c=Q_H\times \eta_c$

$W_c=1000\times 0.4167$

$W_c=416.67\ J$ .......................(1)

From eq. (1) we have the Carnot work, so the difference:

$\Delta W=W_c-W$

$\Delta W=416.67-250$

$\Delta W=166.67\ J$

Now, we find:

$T_L.\Delta S_u=350\times 2.1429$

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3 years ago

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Rzqust [24]

Race relations throughout history has changed over and over. But as far as the modern world race relations have went through all three. Diversity is far more common now ( which I think is positive) .

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4 years ago