Mastering Physics Solutions: Measuring the Potential of a Nonideal Battery

Mastering Physics Solutions: Measuring the Potential of a Nonideal Battery

On March 1, 2013, in Chapter 17: Electric Current and Resistance, by Mastering Physics Solutions

Part A = 88.4 V Click to use the calculator/solver for this part of the problem
Part B = 0.025641 V Click to use the calculator/solver for this part of the problem

A battery with EMF 90.0 V has internal resistance Rb = 8.48 Ω.

What is the reading Vv of a voltmeter having total resistance Rv = 475 Ω when it is placed across the terminals of the battery?
What is the maximum value that the ratio Rb / Rv may have if the percent error in the reading of the EMF of a battery is not to exceed 2.50%?

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Mastering Physics Solutions: Exercise 17.44

Mastering Physics Solutions: Exercise 17.44

On April 21, 2012, in Chapter 17: Electric Current and Resistance, by Mastering Physics Solutions

Part A = 82.62 dollars Click to use the calculator/solver for this part of the problem
Part B = 3.2 Ω Click to use the calculator/solver for this part of the problem

On average, an electric water heater operates for 1.8 h each day.
If the cost of electricity is $0.34 kWh, what is the cost of operating the heater during a 30-day month?
What is the resistance of a typical water heater?

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Mastering Physics Solutions: Exercise 17.32

Mastering Physics Solutions: Exercise 17.32

On April 14, 2012, in Chapter 17: Electric Current and Resistance, by Mastering Physics Solutions

Part A = yes
Part B = The graph is a straight line where V = R * I. R is the slope and is linear. This is the definition of an ohmic resistor (Ohm’s law is V = IR).
Part C = 2.0 Ω
Part D = 18 V

The figure shows data on the dependence of the current through a resistor on the voltage across that resistor.
Is the resistor ohmic?
Explain your reasoning.
What is the value of its resistance?
Use the data to predict what voltage would be needed to produce a 9.0 A current in the resistor.

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Mastering Physics Solutions: C Exercise 17.18

Mastering Physics Solutions: C Exercise 17.18

On April 14, 2012, in Chapter 17: Electric Current and Resistance, by Mastering Physics Solutions

Part A = the copper wire

Two wires are identical except that one is aluminum and the other is copper. Which one’s resistance will increase more rapidly as they are heated?

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Mastering Physics Solutions: Resistance of a Heater

Mastering Physics Solutions: Resistance of a Heater

On April 14, 2012, in Chapter 17: Electric Current and Resistance, by Mastering Physics Solutions

Part A = 12.5 A Click to use the calculator/solver for this part of the problem
Part B = 9.6 ohms Click to use the calculator/solver for this part of the problem
Part C = 16.1 minutes Click to use the calculator/solver for this part of the problem

A 1500-W heater is designed to be plugged into a 120-V outlet.
What current will flow through the heating coil when the heater is plugged in?
What is R, the resistance of the heater?
How long does it take to raise the temperature of the air in a good-sized living room (3.00m x 5.00m x 8.00m) by 10.0°C?

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Mastering Physics Solutions: Heating a Water Bath

Mastering Physics Solutions: Heating a Water Bath

On March 4, 2012, in Chapter 17: Electric Current and Resistance, by Mastering Physics Solutions

Part A = 984 s Click to use the calculator/solver for this part of the problem

In the circuit in the figure, a 20-ohm resistor sits inside 103 g of pure water that is surrounded by insulating Styrofoam.
If the water is initially at temperature 11.7 °C, how long will it take for its temperature to rise to 57.3 °C?16

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