Passage III
An electrical circuit contained a 12-volt (V) battery, a resistor (a device that resists the flow of electricity), a capacitor (a device that stores electrical charge and electrical energy), a voltmeter (an instrument for measuring voltage), and a switch, as shown in Figure 1.
Some students studied the behavior of the circuit.
Experiment 1
The students used a 1 × 107 ohm (Ω) resistor and a capacitor with a capacitance of 1 × 10–6 farad (F). (Capacitance is a measure of the maximum amount of electrical charge and electrical energy a capacitor can store.) The capacitor was initially uncharged. At time zero, the students simultaneously closed the switch and started a stopwatch. At time zero and at 12 sec intervals thereafter, they recorded the voltage across the capacitor. Their results are shown in Table 1.
Experiment 2
Using the 1 × 107 Ω resistor and several different capacitors, the students determined the length of time from when the switch was closed until the voltage across the capacitor reached 6 V. Their results are shown in Table 2.
Experiment 3
The students conducted the same procedure described in Experiment 2, except that they used a constant capacitance of 1 × 10–6 F and several different resistors. Their results are shown in Table 3.
17. Based on Figure 1, to measure the voltage across the resistor only, which of the following circuits should one use?
Your Answer is
Correct Answer is A
Explanation
General knowledge questions.
The stem of the question says to measure the voltage across the resistor only, so you only need to connect the voltmeter and the resistor in parallel, so it is A