A power supply has a fixed output voltage of 12.0 V, but you need V T = 3.3 V ou

Question

A power supply has a fixed output voltage of 12.0 V, but you need VT = 3.3 V output for an experiment.
(Figure 1)

Part A

Using the voltage divider shown in the figure, what should R2 be if R1 is 15.0 ?

Express your answer using two significant figures.

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Part B

What will the terminal voltage VT be if you connect a load to the 3.3 V output, assuming the load has a resistance of 6.9 ?

Express your answer using two significant figures.

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Figure 1 of 1

A power supply has a fixed output voltage of 12.0 V, but you need VT = 3.3 V output for an experiment.
(Figure 1)

Part A

Using the voltage divider shown in the figure, what should R2 be if R1 is 15.0 ?

Express your answer using two significant figures.

R2 =     

SubmitMy AnswersGive Up

Incorrect; Try Again; 3 attempts remaining

Part B

What will the terminal voltage VT be if you connect a load to the 3.3 V output, assuming the load has a resistance of 6.9 ?

Express your answer using two significant figures.

VT =   V  

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Figure 1 of 1

Explanation / Answer

given,

voltage = 12 V

voltage across R2 = 3.3 V

Resistance of R1 = 15 ohm

by kirchoff's voltage law

12 = R1 * I + 3.3

12 = 15 * I + 3.3

I = 0.58 A

By ohm's law

V = I * R

3.3 = 0.58 * R2

a) R2 = 5.689 ohm

if R2 = 6.9 ohm

12 = R1 * I + R2 * I

12 = 15 * I + 6.9 * I

I = 0.548 A

V = I * R2

V = 0.548 * 6.9

b) VT = 3.78 V

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