Chapter 21: Q14CQ (page 771)
Explain which battery is doing the charging and which is being charged in Figure 21.45.
Short Answer
is charged, is doing the charging.
Chapter 21: Q14CQ (page 771)
Explain which battery is doing the charging and which is being charged in Figure 21.45.
is charged, is doing the charging.
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An ECG monitor must have an \(RC\) time constant less than \(1.00 \times {10^2}{\rm{ }}\mu s\) to be able to measure variations in voltage over small time intervals. (a) If the resistance of the circuit (due mostly to that of the patient’s chest) is\(1.00{\rm{ }}k\Omega \), what is the maximum capacitance of the circuit? (b) Would it be difficult in practice to limit the capacitance to less than the value found in (a)?
A \(160 - \mu F\)capacitor charged to \(450\;V\)is discharged through a \(31.2 - k\Omega \)resistor. (a) Find the time constant.(b) Calculate the temperature increase of the resistor, given that its mass is \(2.50\;g\)and its specific heat is \(1.67\frac{{kJ}}{{kg{ \cdot ^\circ }C}}\), noting that most of the thermal energy is retained in the short time of the discharge. (c) Calculate the new resistance, assuming it is pure carbon. (d) Does this change in resistance seem significant?
Verify the third equation in Example 21.5 by substituting the values found for the currents.
(a) What resistance would you put in parallel with a \(40.00 - \Omega \) galvanometer having a \(25.0 - \mu A\) sensitivity to allow it to be used as an ammeter that has a full-scale deflection for \(10.0{\rm{ }}\mu A\) ?
(b) What is unreasonable about this result?
(c) Which assumptions are responsible?
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