Chapter 28: Q. 60 (page 793)
For the circuit shown in FIGURE P28.60, find the current through and the potential difference across each resistor. Place your results in a table for ease of reading.
Short Answer
The result is
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Chapter 28: Q. 60 (page 793)
For the circuit shown in FIGURE P28.60, find the current through and the potential difference across each resistor. Place your results in a table for ease of reading.
The result is
| | |
| | |
| | |
| | |
| | |
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The circuit of FIGURE Q28.4 has two resistors, with . Which of the two resistors dissipates the larger amount of power? Explain.
An oscillator circuit is important to many applications. A simple oscillator circuit can be built by adding a neon gas tube to an RC circuit, as shown in . Gas is normally a good insulator, and the resistance of the gas tube is essentially infinite when the light is off. This allows the capacitor to charge. When the capacitor voltage reaches a value Von, the electric field inside the tube becomes strong enough to ionize the neon gas. Visually, the tube lights with an orange glow. Electrically, the ionization of the gas provides a very-low-resistance path through the tube. The capacitor very rapidly (we can think of it as instantaneously) discharges through the tube and the capacitor voltage drops. When the capacitor voltage has dropped to a value , the electric field inside the tube becomes too weak to sustain the ionization and the neon light turns off. The capacitor then starts to charge again. The capacitor voltage oscillates between , when it starts charging, and , when the light comes on to discharge it.
a. Show that the oscillation period is
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A refrigerator has a compressor, but the compressor runs only of the time.
a. If electricity costs, what is the monthly (30 day) cost of running the refrigerator?
b. A more energy-efficient refrigerator with an compressor costs more. If you buy the more expensive refrigerator, how many months will it take to recover your additional cost?
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