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Chapter 21: Q4CQ (page 771)
Why is the power dissipated by a closed switch, such as in Figure 21.43, small?
Due to the low resistance of a closed switch, the power dissipated is little.
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(a) What is the potential difference going from point \(a\) to point \(b\) in Figure \(21.47\)? (b) What is the potential difference going from \(c\)to \(b\)? (c) From \(e\) to\(g\)? (d) From \(e\) to \(d\)?
When an unknown resistanceis placed in a Wheatstone bridge, it is possible to balance the bridge by adjusting to be . What is if?
Consider a camera's flash unit. Construct a problem in which you calculate the size of the capacitor that stores energy for the flash lamp. Among the things to be considered are the voltage applied to the capacitor, the energy needed in the flash and the associated charge needed on the capacitor, the resistance of the flash lamp during discharge, and the desired \(RC\) time constant.
A certain ammeter has a resistance of \(5.00 \times {10^{ - 5}}{\rm{ }}\Omega \) on its \(3.00 - A\) scale and contains a \(10.0 - \Omega \) galvanometer. What is the sensitivity of the galvanometer?
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鈥檚 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)?
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