6. Place the voltmeter across Ri. Read and record the voltage V 7. Compute the e

Question

6. Place the voltmeter across Ri. Read and record the voltage V 7. Compute the equivalent resistance R from equations 40.25 and 40.26 and record on your data sheet. 8. Compute the theoretical current I from Ohm's law, equation 40.8, and record on your data sheet. Compute theoreti- cal current 12 from equation 40.31 and theoretical current I, from equation 40.32. Compare mental values for the current and determine the percentage error. Compute the theoretical value of the voltage V, from equation 40.27 and the theoretical voltage Va from equation 40.28, and hence voltages V2 and V, from equation 40.29. Record these values on your data sheet. Compare these with the experimental values for the voltages and determine the percentage error. QUESTIONS 1. For resistors in series, does V V, +V2+ V,? 2. For resistors in parallel, does V-V, V V,? 3. For resistors in parallel, does P, + P2+ Ps P 4. Do the ammeter and voltmeter have any affect on the circuit? Explain. 5. Why must ammeters be placed in series in a circuit, whereas voltmeters are placed in paralle?

Explanation / Answer

1) Yes, the total voltage is equal to the sum of the individual voltages.

2) Yes, all the voltages are equal in parallel connection.

3) Yes.

4) Ideally they have no effect on the circuit. Practically they tend to influence the amount of current in the circuits they’re connected to..

5)

In order for a voltmeter to measure a device's voltage, it must be connected in parallel to that device . This is necessary because objects in parallel experience the same potential difference.

In order for an ammeter to measure a device's current, it must be connected in series to that device. This is necessary because objects in series experience the same current.

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