Measure the voltages across the source and bulbs A, B and D. Measure the current

Question

Measure the voltages across the source and bulbs A, B and D. Measure the current at the arrows () marked in the circuit. Next measure the current at the arrows () marked in the circuit. * 12 15 Across Resistor A 3 3s v Across Resistor B 3 35 v 3 35 14 70-A Across Resistor DGy . Add the fourth resistor to the circuit in the position marked by balb C .Remeasure the voltages and currents Acrss Resiser A V10 10 Across Resisor B 10.OS Voltage across Source Across Resistor A SOGV12 Across Resistor B ass Across Resistor a Susu Across Resistor D . 5 Add a third identical resistor in parallel (like bulb C) Remeasure the voltages and currents including resistor C ge across Seurce 10.0av Across Resistor av Is a.S O2-A Based on the results of your experiment, think about what would happen if the resistors were replaced by ideal light bulbs (resistance constant and all the three Across Resistor B bulbs with the same resistance) Acoss Resitor RV Q7. Using full sentences, what would you expect to happen to the brightness of bulb D if the switch were closed as suggested? On what are you basing your prediction? Based on the results of your experiment, think about what would happen if resistors were replaced by ideal light bulbs (resistance constant and al the bulbs with the same resistance Cireuit 3: Now bulb D is moved to the position shown below 06. Using full sentences, what would you expect to happen to the brightness bulb A if the switch were closed as suggested? On what are you basing yo Circuit2: Now another bulb is added in new position D. We want to know wh happens to the brightness of bulb D when the switch is closed. Q8. Using your knowledge of cireuits, what should happen to the brightness of bulb D when the switch is closed? (You shouldn't have to measure anything unless you want to. See if you can figure this out from your understanding of circuits and the behavior of current and voltages.) resistors place the three resistors in a circuit in the positions indicated by bulbs A, B and D

Explanation / Answer

Answering question 6 , Please ask other questions seperately.

The brightness of the Bulb A will decrease. We are basing our prediction on following calculations.

Let each resistance be R. Initial resistance was 3R/2 , when switch is closed resistance become 4R/3.

So the current flowing through bulb A will decrease. and as the net resistance is decreased current across D will increase , increasing its brigthness.'

Hence Brightness of A will decrease and D will increase.

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