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Chapter 32: Q. 35 (page 925)
A resistor dissipates when the rms voltage of the emf is. At what voltage will the resistor dissipate
The voltage of the resistor at is =.
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At what frequency f do a capacitor and a inductor have the same reactance? What is the value of the reactance at this frequency?
Use a phasor diagram to analyze the RL circuit of FIGURE P. In particular,
a. Find expressions for .
b. What is VR in the limits and ?
c. If the output is taken from the resistor, is this a low-pass or a high-pass filter? Explain.
d. Find an expression for the crossover frequency .
Draw the phasor for the emf at
Commercial electricity is generated and transmitted as three-phase electricity. Instead of a single emf, three separate wires carry currents for the emfs over three parallel wires, each of which supplies one-third of the power. This is why the long-distance transmission lines you see in the countryside have three wires. Suppose the transmission lines into a city supply a total of of electric power, a realistic value.
a. What would be the current in each wire if the transmission voltage were ?
b. In fact, transformers are used to step the transmission-line voltage up to . What is the current in each wire?
c. Big transformers are expensive. Why does the electric company use step-up transformers?
A capacitor is connected to a oscillator. The peak current is when the rms voltage is . What is the value of the capacitance ?
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