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 (D) 7.2 × 103 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 6.0-ohm resistor?

(A) 8.0 V(B) 2.0 V (C) 12 V (D) 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 cross-sectional 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 10⋅ 5 J

A 100.-ohm resistor and an unknown resistor are connected in series to a 10.0-volt battery. If the potential drop across the 100-ohm resistor is 4.00 volts, the resistance of the unknown resistor is

(A) 50.0 Ω(B) 100 Ω(C) 150 Ω(D) 200 Ω

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 (C) 3.0 A (B) 2.0 A (D) 16A

If switch S1 is open, the reading of

ammeter A is

(A) 0.50 A (C) 3.0 A (B) 2.0 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?