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Chapter 21: Q18PE (page 775)
What is the internal resistance of an automobile battery that has an emf of and a terminal voltage of while a current of is charging it?
The internal resistance is .
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(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?
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?
To measure currents in Figure \({\rm{21}}{\rm{.49}}\), you would replace a wire between two points with an ammeter. Specify the points between which you would place an ammeter to measure the following: (a) the total current; (b) the current flowing through \({{\rm{R}}_{\rm{1}}}\); (c) through \({{\rm{R}}_{\rm{2}}}\) ; (d) through \({{\rm{R}}_{\rm{3}}}\) . Note that there may be more than one answer to each part.
The hot resistance of a flashlight bulb is , and it is run by a alkaline cell having a internal resistance. (a) What current flows? (b) Calculate the power supplied to the bulb using . (c) Is this power the same as calculated using?
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