Physics Chapter 23
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Physics Chapter 23
- 1.Electrons are made to flow in a wire when there is
- A.
An imbalance of charges in the wire
- B.
More potential energy at one end of the wire than the other
- C.
A potential difference across its ends
- 2.An ampere is a unit of electrical
- A.
Pressure
- B.
Current
- C.
Resistance
- D.
All of these
- E.
None of these
- 3.A wire that carries an electric current
- A.
Is electrically charged
- B.
May be electrically charged
- C.
Is never electrically charged
- 4.A coulomb of charge that passes through a 6-volt battery is given
- A.
6 joules
- B.
6 amperes
- C.
6 ohms
- D.
6 watts
- E.
6 newtons
- 5.Which statement is correct?
- A.
Charge flows in a circuit
- B.
Voltage flows through a circuit
- C.
Resistance is established across a circuit
- D.
Current causes voltage
- 6.Electrons move in an electrical circuit
- A.
By being bumped by other electrons
- B.
By colliding with molecules
- C.
By interacting with an established electric field
- D.
Because the wires are so thin
- E.
None of these
- 7.Heat a copper wire and its electric resistance
- A.
Decreases
- B.
Remains uncharged
- C.
Increases
- 8.Stretch a copper wire so that it is thinner and the resistance between its ends
- A.
Decreases
- B.
Remains unchanged
- C.
Increases
- 9.A wire carrying a current is normally charged
- A.
Negatively
- B.
Positively
- C.
Not at all
- 10.In an ac circuit, the electric field
- A.
Increases via the inverse square law
- B.
Changes magnitude and direction with time
- C.
Is everywhere the same
- D.
Is non-existent
- E.
None of these
- 11.The current through a 10-ohm resistor connected to a 120-V power supply is
- A.
1 A
- B.
10 A
- C.
12 A
- D.
120 A
- E.
None of these
- 12.A 10-ohm resistor has a 5-A current in it. What is the voltage across the resistor?
- A.
5 V
- B.
10 V
- C.
15 V
- D.
20 V
- E.
More than 20 V
- 13.When a 10-V battery is connected to a resistor, the current in the resistor is 2A. What is the resistor's value?
- A.
2 ohms
- B.
5 ohms
- C.
10 ohms
- D.
20 ohms
- E.
More than 20 ohms
- 14.The source of electrons in an ordinary electrical circuit is
- A.
A dry cell, wet cell or battery
- B.
The back emf of motors
- C.
The power station generator
- D.
The electrical conductor itself
- E.
None of these
- 15.The source of electrons lighting an incandescent as light bulb is
- A.
The power company
- B.
Electrical outlet
- C.
Atoms in the light bulb filament
- D.
The wire leading to the lamp
- E.
The source voltage
- 16.A woman experiences an electrical shock. The electrons making the shock come from the
- A.
Woman's body
- B.
Ground
- C.
Power plant
- D.
Hairdryer
- E.
Electric field in the air
- 17.In a common dc circuit, electrons move at speeds of
- A.
A fraction of a centimeter per second
- B.
Many centimeters per second
- C.
The speed of a sound wave
- D.
The speed of light
- E.
None of these
- 18.When a light switch is turned on in a dc circuit, the average speed of electrons in the lamp is
- A.
The speed of sound waves in metal
- B.
The speed of light
- C.
1000 cm/s
- D.
Less than 1 cm/s
- E.
Dependent on how quickly each electron bumps into the next electron
- 19.Alternating current is normally produced by a
- A.
Battery
- B.
Generator
- C.
Both of these
- D.
Neither of these
- 20.The electric power of a lamp that carries 2 A at 120 V is
- A.
1/6 watts
- B.
2 watts
- C.
60 watts
- D.
20 watts
- E.
240 watts
- 21.When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is
- A.
More than the resistance of either lamp
- B.
Less than the resistance of either lamp
- C.
None of these
- 22.When two lamps are connected in series to a battery, the electrical resistance that the battery senses is
- A.
More than the resistance of either lamp
- B.
Less than the resistance of either lap
- C.
None of these
- 23.On some early automobiles both headlights went out when one bulb burned out. The headlights must have been connected in
- A.
Parallel
- B.
Perpendicular
- C.
Series
- D.
Haste
- 24.Modern automobile headlights are connected in
- A.
Parallel
- B.
Perpendicular
- C.
Series
- D.
None of these
- 25.There are electrons int he filament of the ac lamp in your bedroom. When you turn on the lamp and it glows, the glowing comes from
- A.
Different electrons; the ones that flow in the circuit to your lamp
- B.
The same electrons
- C.
The positive charges that flow in the filament
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