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Chapter 21: Q40PE (page 776)
Find the currents flowing in the circuit in Figure 21.47.
The currents flowing in the circuit
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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?
Two different automobile batteries on a store shelf are rated at and “cold cranking amps.” Which has the smallest internal resistance?
Why can a null measurement be more accurate than one using standard voltmeters and ammeters? What factors limit the accuracy of null measurements?
Refer to Figure 21.7and the discussion of lights dimming when a heavy
appliance comes on. (a) Given the voltage source is 120 V, the wire resistance is,and the bulb is nominally 75.0W , what power will the bulb dissipate if a total of 15.0 Apasses through the wires when the motor comes on? Assume negligible change in bulb resistance. (b) What power is consumed by the motor?
(a) Calculate the capacitance needed to get an \(RC\)time constant of \(1.00 \times {10^3}\;s\) with a \(0.100 - \Omega \) resistor. (b) What is unreasonable about this result?(c) Which assumptions are responsible?
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