Pretest: A model for circuits part 2: potential difference Name Pretests I. All

Question

Pretest: A model for circuits part 2: potential difference Name Pretests I. All the bulbs in the circuit shown at right are identical. Assume that the battery is ideal, The switch is initially closed. a. Rank the four bulbs in order of brightness from brightest to dimmest. If two or more bulbs are equal in brightness, indicate chis in your response Switch Explain the reasoning you used to determine this ranking b. Compare the voltage across bulb A to the voltage across bulb D. Explain c. Compare the voltage across bulb B to the voltage across bulb C. Explain. The switch is now opened Does the brightness of bulb D increase, decrease, or remain the same? Explain ImchN Switch Does the brightness of bulb A increase, decrease, or remain the same? Explain. orials in Introductory Physics Dermott, Shaffer, and PE.G, U. Wash. CPrentice Hall, Inc First Edition, 2003

Explanation / Answer

A) A>D > B =C

It is because maximum current flows in A.

Resistance in D branch is less than B-C branch. So current in D is more than B, C. B and C will have equal current.

B) Voltage across A is more than D. It is because V=iR

C) Voltage across B and C are equal because they are in series in same branch. V=iR

D) Brightness of D increases as Voltage increases across it.

E) Brightness of bulb A decreases because equivalent resistance increases leading to less current.

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