Chapter 31: 54P (page 938)
What is the maximum value of an ac voltage whose RMS value is 100 V?
Short Answer
The maximum value of an ac voltage is 141 V.
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Chapter 31: 54P (page 938)
What is the maximum value of an ac voltage whose RMS value is 100 V?
The maximum value of an ac voltage is 141 V.
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In an oscillating LCcircuit withand, the current is initially a maximum. How long will it take before the capacitor is fully charged for the first time?
A variable capacitor with a range from 10 to 365pF is used with a coil to form a variable-frequency LCcircuit to tune the input to a radio. (a) What is the ratio of maximum frequency to minimum frequency that can be obtained with such a capacitor? If this circuit is to obtain frequencies from 0.54 MHz to 1.6 0MHz, the ratio computed in (a) is too large. By adding a capacitor in parallel to the variable capacitor, this range can be adjusted. To obtain the desired frequency range,(b) What capacitance should be added ? (c) What inductance should the coil have?
The ac generator in Fig. 31-39 supplies at . With the switch open as in the diagram, the current leads the generator emf by . With the switch in position 1, the current lags the generator emf by . When the switch is in position 2, the current amplitude is . What are (a) R, (b) L, and (c) C?

A transformer has 500primary turns and secondary turns. (a) If role="math" localid="1663224210090" is 120 V(RMS),what is with an open circuit? (b) If the secondary now has a resistive load ofrole="math" localid="1663224020026" , what is the current in the primary? (c) If the secondary now has a resistive load of what is the current in the secondary?
Figure 31-19 shows three oscillating LC circuits with identical inductors and capacitors. At a particular time, the charges on the capacitor plates (and thus the electric fields between the plates) are all at their maximum values. Rank the circuits according to the time taken to fully discharge the capacitors during the oscillations greatest first.
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