deriratile, as the ameter shuld hac litle to no remilome. 2. When a voltmeter is connected across the terminal of a resistor, what usually happens to the potential difference across the resistor? What does the answer to this question suggest about the desirable design for voltmeter?
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When a voltmeter is connected across the terminals of a resistor, the potential difference across the resistor is measured by the voltmeter. The potential difference itself does not change because the voltmeter is designed to have a very high resistance, so it Show more…
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In measuring a voltage, a voltmeter uses some current from the circuit. Consequently, the voltage measured is only an approximation to the voltage present when the voltmeter is not connected. Consider a circuit consisting of two $1550-\Omega$ resistors connected in series across a $60.0-\mathrm{V}$ battery. $\quad$ (a) Find the voltage across one of the resistors. (b) A nondigital voltmeter has a full-scale voltage of 60.0 $\mathrm{V}$ and uses a galvanometer with a full-scale deflection of 5.00 $\mathrm{mA}$ . Determine the voltage that this voltmeter registers when it is connected across the resistor used in part (a).
To extend the useful range of a voltmeter, an additional resistor, $R_{\text {scric, }}$ is placed in series with the voltmeter as shown in the figure. If the internal resistance of the voltmeter is $R_{i, v}$ determine the resistance that the added series resistor has to have to extend the useful range of the voltmeter by a factor $N$. Then, calculate the resistance the series resistor has to have to allow a voltmeter with an internal resistance of $1.00 \mathrm{M} \Omega\left(10^{6} \Omega\right)$ and a maximum range of $1.00 \mathrm{~V}$ to measure potential differences up to $100 .$ V. What fraction of the total 100.-V potential drop occurs across the voltmeter, and what fraction of that drop occurs across the added series resistor?
In measuring a voltage, a voltmeter uses some current from the circuit. Consequently, the voltage measured is only an approximation to the voltage present when the voltmeter is not connected. Consider a circuit consisting of two $1550-\Omega$ resistors connected in series across a $60.0-\mathrm{V}$ battery. (a) Find the voltage across one of the resistors. (b) A voltmeter has a full-scale voltage of $60.0 \mathrm{~V}$ and uses a galvanometer with a full-scale deflection of $5.00 \mathrm{~mA}$. Determine the voltage that this voltmeter registers when it is connected across the resistor used in part (a).
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