AP Physics C E and M 11.5: Measuring Current and Voltage

Describe how current and potential difference are measured in a circuit and how measurement devices are connected to circuit elements.

[Maximum number: 1]

Students are asked to determine the resistance R of identical resistors $\mathrm{R}_{\mathrm{A}}$ and $\mathrm{R}_{\mathrm{B}}$ . The resistors are connected in series with each other, a battery of known emf $\mathcal{E}$ , an inductor of known inductance L, and a switch, as shown in Figure 1. The students have access to a voltmeter that can measure potential difference as a function of time. The students are required to measure a quantity that increases with time to determine R.

On the circuit diagram shown in Figure 1, draw the voltmeter, using the following symbol, with connections that would allow the students to correctly measure a potential difference that increases with time.

Figure for Question 11.5.C—Describe the measurement of current and potential difference in a circuit question 1 — AP Physics C: Electricity & Magnetism

Voltmeter Symbol

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11.5.C—Describe the measurement of current and potential difference in a circuit question 1