A circuit is supplied with 30 VDC and contains three resistors connected in series. The value or R1 is 80 , the value of R2 is 1,000 , and the value of R3 is 4,200 . What is the voltage drop across R2?

Answers

Answer 1

Answer: The answer is 5.68 Volts.

So givens are electric supply of 30 VDC and the values of 3 resistors.

Given:
E= 30 VDC
R1 = 80 Ohms
R2 = 1000 Ohms
R3= 42000 Ohms

And what we are looking for is the voltage on the second resistor.
First we have to get the current of the circuit.

I = E/(R1+R2+R3)
I = 30 / (80+1000+4200)
I = 30 / (5280)
I = 0.00568 A

Then get the voltage V = I x R

V = 0.00568 x 1000
V = 5.68 V

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Given that the time to read data off a 7200 rpm disk drive will be roughly 75% of a 5400 rpm disk, at what idle time of the 7200 rpm disk will the power consumption be equal, on average, for the two disks?

Answers

Answer:

Given that the time to read data off a 7200 rpm disk drive will be roughly 75% of 5400 rpm disk, at 30% idle time of 7200 rpm disk will the power consumption be equal, on average for the two disk

Explanation:

Let the 7200-disk busy time = x ( we need to calculate it)

As given in the question the in the given time to read data off a 7200 rpm disk drive will be roughly 75% of 5400 rpm disk. This mean that we equalize the equations of both disk power

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here we apply the formula to calculate the 7200 rpm disk busy time

4.0 * (1-x) + 7.9 * x = 2.9 * (1-x/0.75) + 7.0 * x/0.75

4.0 + 3.9 x = 2.9 – 3.87 x + 9.33 x

1.1 = 5.47 x – 3.9 x

we calculate the value for x

Hence x = 0.70

Applying formula to calculate the idle time.

Idle time = 1.0 – 0.70 = 0.30

Zach works in an accounting department at a hotel. He needs to calculate the state income taxes on an employee's wages. He has calculated the wages in cell C2. He should use 5.7% for the state income taxes. What formula should he use?

Answers

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Answers

Answer:

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Answers

Answer:

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Answers

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Answers

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