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Problem 1
Draw a circuit diagram for the circuit of FIGURE EX28.1.
Problem 2
Draw a circuit diagram for the circuit of FIGURE EX28.2.
Problem 6b
Draw a graph of the potential as a function of the distance traveled through the circuit, traveling cw from V = 0 V at the lower left corner.
Problem 9a
A 60 W lightbulb and a 100 W lightbulb are placed in the circuit shown in FIGURE EX28.9. Both bulbs are glowing. Which bulb is brighter? Or are they equally bright?
Problem 11
The five identical bulbs in FIGURE EX28.11 are all glowing. The battery is ideal. What is the order of brightness of the bulbs, from brightest to dimmest? Some may be equal.
Problem 13
A 100 W (120 V) incandescent lightbulb contains a 7.0-cm-long tungsten filament. The high-temperature resistivity of tungsten is 9.0 x 10⁻⁷ Ωm. What is the diameter of the filament?
Problem 14a
A typical American family uses 1000 kWh of electricity a month. What is the average current in the 120 V power line to the house?
Problem 14b
A typical American family uses 1000 kWh of electricity a month. On average, what is the resistance of a household?
Problem 15
Many electric companies use time-of-day pricing in which electricity costs more during hours of high demand. Suppose electricity costs $0.21/kWh from 10 a.m. to 6 p.m.; $0.09/kWh at all other times. What is the annual cost of electricity for a 2.5 kW industrial pump that runs 24 hours a day?
