Physics Review #1
LCHS
Dr.E
A positive test charge is placed between an
electron, e, and a proton, p, as shown in the
diagram below.
When the test charge is released, it will move
toward
(A) A
(B) B
(C) C
(D) D
In a simple electric circuit, a 110-volt
electric heater draws 2.0 amperes of
current. The resistance of the heater is
(A) 0.018 Ω
(B) 28 Ω
(C) 55 Ω
(D) 220 Ω
A potential drop of 50 volts is measured
across a 250-ohm resistor. What is the
power developed in the resistor?
(A) 0.20 W
(B) 5.0 W
(C) 10 W
(D) 50 W
In a flashlight, a battery provides a total
of 3.0 volts to a bulb. If the flashlight
bulb has an operating resistance of 5.0
ohms, the current through the bulb is
(A) 0.30 A
(B) 0.60 A
(C) 1.5 A
(D) 1.7 A
An electric drill operating at 120 volts
draws a current of 3.00 amperes. What is
the total amount of electrical energy
used by the drill during 1.00 minute of
operation?
(A) 2.16 × 104 J
(B) 2.40 × 103 J
(C) 3.60 × 102 J
(D) 4.00 × 101 J
A complete circuit is left on for several
minutes, causing the connecting copper
wire to become hot. As the temperature
of the wire increases, the electrical
resistance of the wire
(A) decreases
(B) increases
(C) remains the same
A 1.5-volt, AAA cell supplies 750 milliamperes of
current through a flashlight bulb for 5.0 minutes,
while a 1.5-volt, C cell supplies 750 milliamperes
of current through the same flashlight bulb for 20
minutes. Compared to the total charge transferred
by the AAA cell through the bulb, the total charge
transferred by the C cell through the bulb is
(A) half as great
(B) twice as great
(C) the same
(D) four times as great
If the potential difference applied to a
fixed resistance is doubled, the power
dissipated by that resistance
(A) remains the same
(B) doubles
(C) halves
(D) quadruples
The electrical resistance of a metallic
conductor is inversely proportional to its
(A) temperature
(B) length
(C) cross-sectional area
(D) resistivity
In a simple electric circuit, a 24-ohm
resistor is connected across a 6.0-volt
battery. What is the current in the
circuit?
(A) 1.0 A
(B) 0.25 A
(C) 140 A
(D) 4.0 A
An operating 100-watt lamp is connected
to a 120-volt outlet. What is the total
electrical energy used by the lamp in
60 seconds?
(A) 0.60 J
(B) 1.7 J
(C) 6.0 × 103 J
3
(D) 7.2 × 10 J
A 3.0-ohm resistor and a 6.0-ohm resistor
are connected in series in an operating
electric circuit. If the current through the
3.0-ohm resistor is 4.0 amperes, what is
the potential difference across the 6.0ohm resistor?
(A)
(B)
(C)
(D)
8.0 V
2.0 V
12 V
24 V
An electric heater operating at 120 volts
draws 8.00 amperes of current through its
15.0 ohms of resistance. The total
amount of heat energy produced by the
heater in 60.0 seconds is
(A) 7.20 × 103 J
(B) 5.76 × 104 J
(C) 8.64 × 104 J
(D) 6.91 × 106 J
A charge of 30 coulombs passes through
a 24-ohm resistor in 6.0 seconds. What is
the current through the resistor?
(A) 1.3 A
(B) 5.0 A
(C) 7.5 A
(D) 4.0 A
A small electric motor is used to lift a
0.50-kilogram mass at constant speed. If
the mass is lifted a vertical distance of
1.5 meters in 5.0 seconds, the average
power developed by the motor is
(A) 0.15 W
(B) 1.5 W
(C) 3.8 W
(D) 7.5 W
The graph represents the
relationship between
the current in a metallic
conductor and the
potential difference
across the conductor at
constant temperature. The resistance (Ω)
of the conductor is
(A) 1.0 (B) 2.0 (C) 0.50
(D) 4.0
An electric circuit contains a variable
resistor connected to a source of
constant voltage. As the resistance of the
variable resistor is increased, the power
dissipated in the circuit
(A) decreases
(B) increases
(C) remains the same
A circuit consists of a resistor and a
battery. Increasing the voltage of the
battery while keeping the temperature of
the circuit constant would result in an
increase in
(A) current, only
(B) resistance, only
(C) both current and resistance
(D) neither current nor resistance
A metal wire has length L and crosssectional area A. The resistance of the
wire is directly proportional to
(A) L A
(B) A/L
(C) L / A
(D) L + A
What is the total electrical energy used
by a 1500-watt hair dryer operating for
6.0 minutes?
(A) 4.2 J
(B) 9.0 x 103 J
(C) 250 J
(D) 5.4 ⋅ 105 J
A 100.-ohm resistor and an unknown
resistor are connected in series to a 10.0volt battery. If the potential drop across
the 100-ohm resistor is 4.00 volts, the
resistance of the unknown resistor is
(A) 50.0 
(B) 100 
(C) 150 
(D) 200 
What is the current in the 5.0-ohm
resistor?
(A) 1.0 A
(B) 1.8 A
(C) 2.3 A
(D) 4.0 A
The circuit diagram represents four
resistors connected to a 12-volt source.
What is the total current in the circuit?
(A) 0.50 A
(B) 2.0 A
(C) 8.6 A
(D) 24 A
The diagram represents a lamp, a 10-volt
battery, and a length of nichrome wire
connected in series. As the temperature of the
nichrome is decreased, the brightness of the
lamp will
(A) decrease (B) increase (C) remain the same
An electric circuit contains a variable
resistor connected
to a source of
constant potential
difference. Which
graph best
represents the
relationship
between current
and resistance in
this circuit?
The rate at which electrical energy is
expended in this circuit is
(A) 8.0 W
(B) 16 W
(C) 32 W
(D) 64 W
A circuit consists of a 10.0-ohm resistor,
a 15.0-ohm resistor, and a 20.0-ohm
resistor connected in parallel across a
9.00-volt battery. What is the equivalent
resistance of this circuit?
(A) 0.200 Ω
(B) 1.95 Ω
(C) 4.62 Ω
(D) 45.0 Ω
In which circuit would ammeter A show
the greatest current?
In the circuit diagram shown below, ammeter A1
reads 10 amperes. What is the reading of ammeter
A2?
(A) 6.0 A (B) 10 A
(C) 20 A
(D) 4.0 A
Which
circuit has
the
smallest
equivalent
resistance?
Three resistors, 4 ohms, 6 ohms, and 8
ohms, are connected in parallel in an
electric circuit. The equivalent resistance
of the circuit is
(A) less than 4 Ω
(B) between 4 Ω and 8 Ω
(C) between 10 Ω and 18 Ω
(D) 18 Ω
If a 15-ohm resistor is connected in
parallel with a 30.-ohm resistor, the
equivalent resistance is
(A) 15 Ω
(B) 10 Ω
(C) 2.0 Ω
(D) 45 Ω
What is the total resistance of the circuit
segment?
(A) 1.0 Ω
(B) 3.0 Ω
(C) 9.0 Ω
(D) 27 Ω
If switch S1 is closed, the reading of
ammeter A is
(A) 0.5 A
(B) 2.0 A
(C) 3.0 A
(D) 16A
If switch S1 is open, the reading of
ammeter A is
(A) 0.50 A
(B) 2.0 A
(C) 3.0 A
(D) 16 A
In the circuit diagram, what are the
correct readings of voltmeters V1 and
V2?
(A) V1 reads 2.0 V and V2 reads 4.0 V
(B) V1 reads 4.0 V and V2 reads 2.0 V
(C) V1 reads 3.0 V and V2 reads 3.0 V
(D) V1 reads 6.0 V and V2 reads 6.0 V
Which circuit diagram shows voltmeter V
and ammeter A correctly positioned to
measure the total potential difference of
the circuit and the current through each
resistor?