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If the current I is reduced to 10 µA, what are the new values of R1, R2, and R3? How do they compare to the results of part (a)?
Find the internal resistance of a battery that has a no-load output voltage of 6 V.
Find the internal resistance of a battery that has a no-load output voltage of 60 V and that supplies a current of 2 A to a load of 28 O.
Determine the current I and its direction for each network of Figure.
Find the unknown voltage source and resistor for the networks of Figure.
Determine the unknown voltages using Kirchhoff's voltage law.
If the resistors are available with wattage ratings of 1/2, 1, and 2 W, what minimum wattage rating can be used for each resistor in this circuit?
Find the power dissipated by each resistor, and note whether the power delivered is equal to the power dissipated.
If the set is connected to a 120-V source, what is the current through the bulbs if each bulb has an internal resistance of 28 1/ 8 O ?
Find the unknown resistance using the voltage divider rule and the information provided for the circuits of Figure.
Design a voltage divider circuit that will permit the use of an 8-V, 50-mA bulb in an automobile with a 12-V electrical system.
A stereo system draws 2.4 A at 120 V. The audio output power is 50 W. How much power is lost in the form of heat in the system?
If an electric motor having an efficiency of 87% and operating off a 220-V line delivers 3.6 hp.
If it runs on 110 V and is 90% efficient, how many watts does it draw from the power line?
What is the total efficiency of three systems in cascade with efficiencies of 98%, 87%, and 21%?
If the resistor is left connected for 2 min instead of 1 min, will the energy used increase? Will the power dissipation level increase?
In 10 h an electrical system converts 500 kWh of electrical energy into heat. What is the power level of the system?
At 9¢ per kilowatthour, how long can one play a 250-W color television for $1?
What is the total cost of using the at 9¢ per kilowatthour? 110-W stereo set for 4 h.
Analysis of the circuit of Figure, but reverse the polarity of the battery and use E = 0.02 V and R =240O .
If the calculator is rated to operate 500 h on the same battery, what is the ampere-hour rating of the battery?
Use a power scale from 0 to 1 W and a current scale from 0 to 100 mA with divisions of 0.1 W and 10 mA, respectively.
A small, portable black-and-white television draws 0.455A at 9V.
If a home is supplied with a 120-V, 100-A service, find the maximum power capability.
Sketch the characteristics of a device that has an internal resistance of 20O from 0 to 10 V and an internal resistance of 2 O for higher voltages.