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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.
Use a horizontal scale that extends from 0 to 20 V and a vertical axis scaled off in milliamperes.
Using the axes of Fig. , sketch the characteristics of a device that has an internal resistance of 500 O from 0 to 1 V and 50O between 1 V and 2 V.
What is the approximate increase in size from a 1/2-W to a 2-W carbon resistor?
What is its approximate resistance at -30°C and 100°C (boiling)?
If the resistance between the outside terminals of a linear potentiometer is 10 kO, what is its resistance between the wiper (movable) arm .
What is the resistance between the wiper arm and each terminal if the total resistance is 25 kO?
Show the connections required to establish 4 k O between the wiper arm and one outside terminal of a 10-kO potentiometer while having only zero ohms .
Is there an overlap in coverage between 20% resistors?
Find the conductance of each of the resistances- 0.086O , 4 k O and 2.2 MO.
The conductance of a wire is 100 S. If the area of the wire is increased by 2/3 and the length is reduced by the same amount.
Does the thermistor have a positive or a negative temperature coefficient?
Is the coefficient a fixed value for the range 0.1 to 1000 foot-candles? Why?
Compare the ratio of maximum to minimum current levels above to the corresponding ratio of voltage levels.
What is the resistance of a copper bus-bar, as used in the power distribution panel of a high-rise office building.