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STATIC ELECTRICITY
STATIC ELECTRICITY
ELECTRIC CIRCUITS
ELECTRIC CIRCUITS
WAVES
100
The outer shell electrons in metals are not tightly bound to the nuclei of their atoms. They are free to roam throughout the material, moving from atom to atom. These materials are good ____.
CONDUCTORS
100
Two like charges ________.
REPEL EACH OTHER
100
Determine the ..... current in a 60-watt bulb plugged into a 120-volt outlet.
0.5 A
100
Determine the ...power of a saw that draws 12 amps of current when plugged into a 120-volt outlet.
1440 W
100
If the particles of the medium are vibrating to and fro in the same direction of energy transport, then the wave is a ____ wave.
longitudinal
200
If an electroscope, charged up with excess negative charge, is touched and grounded, then it will end up with ___ charge.
NO OR ZERO
200
If you comb your hair and the comb becomes positively charged, then your hair becomes _______.
NEGATIVELY CHARGED
200
Which of the following will cause the current through an electrical circuit to decrease? Choose all that apply. a. decrease the voltage b. decrease the resistance c. increase the voltage d. increase the resistance
AD
200
A certain electrical circuit contains a battery with three cells, wires and a light bulb. Which of the following would cause the bulb to shine less brightly? Choose all that apply. a. increase the voltage of the battery (add another cell) b. decrease the voltage of the battery (remove a cell) c. decrease the resistance of the circuit d. increase the resistance of the circuit
BD
200
When the particles of a medium are vibrating at right angles to the direction of energy transport, then the wave is a ____ wave.
transverse
300
Charge carriers in a metal are electrons rather than protons. This is due to the fact that electrons are __________.
LOOSELY BOUND
300
Which of the following charging methods can result in charging an object with a negative charge? Choose all that apply. a. charging by friction b. charging by contact c. charging by induction
ABC
300
If the resistance of a circuit were tripled, then the current through the circuit would be ____.
one-third as much
300
If the voltage across a circuit is quadrupled, then the current through the circuit would be ____.
four times as much
300
As a wave travels into a medium in which its speed increases, its wavelength would ____.
INCREASE
400
Which of the following are true of static charges? Choose all that apply. (A) Like charges repel. (B) Like charges attract. (C) Opposite charges repel. (D) Opposite charges attract. (E) A positively charged object has lost electrons. (F) A positively charged object has gained protons. (G) A negatively charged object has lost protons. (H) A negatively charged object has gained electrons.
ADEH
400
Which of the following charging methods work without ever touching the object to be charged to the object used to charge it? Choose all that apply. a. charging by friction b. charging by contact c. charging by induction
C
400
Calculate the resistance and the current of a 7.5-Watt night light bulb plugged into a US household outlet (120 V).
I = 0.0625 Amp R = 1920 Ω
400
Calculate the resistance and the current of a 1500-Watt electric hair dryer plugged into a US household outlet (120 V).
I = 12.5 Amp R = 9.6 Ω
400
A periodic and repeating disturbance in a lake creates waves which emanate outward from its source to produce circular wave patterns. If the frequency of the source is 2.00 Hz and the wave speed is 5.00m/s then the distance between adjacent wave crests is ___ meter.
2.50
500
Which of the following statements are true statements about electric force? Choose all that apply. (A) Electric force is a contact force. (B) Electric forces can only act between charged objects - either like-charged or oppositely-charged. (C) Electric forces between two charged objects increases with increasing separation distance. (D) Electric forces between two charged objects increases with increasing quantity of charge on the objects. (E) If object A attracts object B with an electric force, then the attractive force must be mutual - i.e., object B also attracts object A with the same force. (F) A doubling of the quantity of charge on one of the objects results in a doubling of the electric force. (G) A tripling of the quantity of charge on both of the objects results in an increase in the electric force by a factor of 6. (H) A doubling of the separation distance between two point charges results in a quadrupling of the electric force. (I) A tripling of the separation distance between two point charges results in an electric force which is one-sixth of the original value.
DEF
500
A balloon with a charge of 4.0 X 10^-6 C is held a distance of 0.70 m from a second balloon having the same charge. Calculate the magnitude of the repulsive force.
0.29 N
500
Which of the following statements are true about an electric resistance? List all that apply. (A) The resistance of an electric circuit is a measure of the overall amount of hindrance to the flow of charge through the circuit. (B) A large resistance value indicates that the charge is encountering a relatively large amount of difficulty in moving through the circuit. (C) The unit of resistance is the ampere. (D) A 5-ohm resistor would allow a current of 0.5 Amperes when 2.5 Volts is impressed across it. (E) A 10-ohm resistor would allow a current of 2 Amperes when 5 Volts is impressed across it. (F) The resistance of a conducting wire will increase as the length of the wire is increased. (G) The resistance of a conducting wire will increase as the cross-sectional area of the wire is increased. (H) Increasing the resistance of an electric circuit will cause the current in the circuit to increase. (I) A threefold increase in the resistance of an electric circuit will result in a threefold decrease in the electric current. (J) A miniature light bulb with a specific resistance is connected to a 1.5-Volt battery to form a circuit. If it were connected to a 6-Volt battery instead, its resistance would increase by a factor of 4.
ABDFI
500
Which of the following statements are true about a series circuit? List all that apply. (A) Series circuits are characterized by the fact that there is a single pathway by which charge can travel from the + terminal to the - terminal. (B) During any single loop of charge around a series circuit, the charge will pass through each resistor in the circuit. (C) The overall resistance of a circuit increases as more and more resistors are placed in series in the circuit. (D) The total current in a circuit increases as more and more resistors are placed in series in the circuit. (E) Suppose that three identical resistors with a resistance of 3-ohms are placed in series with a 12-Volt battery. The current in the circuit is 4 Amps. (F) Suppose that three identical resistors with a resistance of 3-ohms are placed in series with a 12-Volt battery. The electric potential difference across each resistor is 12 Volts. (G) Suppose that two identical resistors are placed in series with a 12-Volt battery. The current in the circuit is 6 amps. The resistance of each resistor is 4 ohms.
ABC
500
If the frequency of a wave is doubled and if the speed remains constant, its wavelength is ____.
HALVED