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Chapter 21: Q16PE (page 775)
What is the output voltage of a 3.00 v lithium cell in a digital wristwatch that draws 0.300mv , if the cell's internal resistance is ?
The terminal voltage is 2.9994 V.
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Using the exact exponential treatment, find how much time is required to charge an initially uncharged capacitor through alocalid="1656397542799" resistor toof its final voltage.
Figure 21.55 shows how a bleeder resistor is used to discharge a capacitor after an electronic device is shut off, allowing a person to work on the electronics with less risk of shock. (a) What is the time constant? (b) How long will it take to reduce the voltage on the capacitor to (5% of 5%) of its full value once discharge begins? (c) If the capacitor is charged to a voltage V0 through a 100-Ω resistance, calculate the time it takes to rise to 0.865V0 (This is about two-time constants.)
Consider a rechargeable lithium cell that is to be used to power a camcorder. Construct a problem in which you calculate the internal resistance of the cell during normal operation. Also, calculate the minimum voltage output of a battery charger to be used to recharge your lithium cell. Among the things to be considered are the emf and useful terminal voltage of a lithium cell and the current it should be able to supply to a camcorder.
Apply the loop rule to loops \({\rm{abgefa}}\) and \({\rm{cbgedc}}\) in Figure \({\rm{21}}{\rm{.47}}\).
(a) Find the terminal voltage of a motorcycle battery having a internal resistance, if it is being charged by a current of (b) What is the output voltage of the battery charger?
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