Physics Principles and Problems 2009

Chapter 22: Current Electricity

Standardized Test Practice

1
A 9.0 V battery delivers a 1.1-A current to an electric motor. How much power is delivered to the motor?
A)8.2 W
B)9.9 W
C)11 W
D)12 W
2
If a 9.0-V battery delivers0.55 A of current through a circuit, what is the resistance of the circuit?
A)5.0 Ω
B)6.1 Ω
C)16 Ω
D)45 Ω
3
A burner on an electric stovetop converts electric energy to thermal energy. How much thermal energy is supplied by the burner in 8.0 s if it draws 1.24 kW of power?
A)1.6 kJ
B)6.5 kJ
C)7.9 kJ
D)9.9 kJ
4
The diagram below shows a simple electric circuit. How much would the power increase if the 6.0-V battery were replaced with a 9.0-V battery?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617930/bv.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>
A)1.3 W
B)2.3 W
C)2.5 W
D)4.0 W
5
What is the resistance of a circuit connected to a 14.0-V battery if it supplies 2.70 × 102 J of energy in 20.0 s.
A)7.56 Ω
B)10.4 Ω
C)14.5 Ω
D)18.9 Ω
6
The diagram below shows the circuit for a heater. How much thermal energy does the heater provide in 20.0 s?

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A)24.0 kJ
B)12.0 kJ
C)10.0 kJ
D)8.0 kJ
7
A circuit with 15.0-Ω resistance supplies 4.12 × 102 J of thermal energy in 11.5 s. What is the current through the circuit?
A)1.55 A
B)1.78 A
C)2.31 A
D)2.39 A
8
A 9.0-V battery delivers a 0.50-A current to a bulb connected across its terminals. What power is delivered to the bulb?
A)0.056 W
B)4.5 W
C)18 W
D)41 W
9
How much electric energy is delivered by a motor that supplies 3.0 W of power in 1.0 minutes?
A)3.0 J
B)12 J
C)18 J
D)180 J
10
What is the potential difference, in volts, required to pass a current of 3.0 A through a resistor of 6.0 Ω?
A)2.0 V
B)3.0 V
C)12 V
D)18 V
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