b. Consider the following student predictions and explanations of the brightness of bulbs for the circuit on the right. Identify in your lab records whether each student's prediction is correct or incorrect. If their reasoning is faulty, explain and correct the error(s).
Student 1: B < C < A. Bulbs B and C must split the current going through the battery, but bulb A gets the full flow.
Student 2: Bulb A has more resistance than that presented by the B-C parallel network, so bulb A has more voltage across it. Therefore, A > B.
Student 3: Bulb A uses up most of the current, leaving less for B and C. Therefore, A > B = C.
c. Consider the circuit with a switch as shown at right. Predict in your lab records the change in voltage across the battery, bulbs A, B, and C, and the switch when the switch is closed.
Bulb A's voltage will increase, decrease, not change, go to zero.
Bulb B's voltage will increase, decrease, not change, go to zero.
Bulb C's voltage will increase, decrease, not change, go to zero.
Battery's voltage will increase, decrease, not change, go to zero.
Switch's voltage will become.