Q&A Hero

Q: Power may be expressed as _____________ times resistance.

Q: The expression V= IRis called ______________.

Q: The resistances are added in a(n) ______________ circuit.

Q: The expression that mathematically describes the force between two static electric charges is called ______________.

Q: Voltage has the units of _____________, which is called a volt.

Q: Another name for electric potential difference is ______________.

Q: In a(n) ______________, electrons do not move freely.

Q: An object may be electrically neutral, but regions may be charged by _____________.

Q: According to the law of charges, unlike charges _________.

Q: The unit of electric current is the _____________.

Q: The rate of flow of electric charge is measured in units called ______________.

Q: Two oppositely charged particles ______________ one another.

Q: If a negatively charged object is brought near a suspended, positively charged object, the suspended object will be ______________.

Q: A(n) ______________ is an elementary particle with a charge of +1.6 x 10-19coulomb.

Q: If a positively charged object is brought near a suspended, negatively charged object, the suspended object will be A) repelled. B) charged more. C) discharged. D) attracted.

Q: If a negatively charged object is brought near a suspended, negatively charged object, the suspended object will be A) repelled. B) charged more. C) discharged. D) attracted.

Q: If a positively charged object is brought near a suspended, positively charged object, the suspended object will be A) repelled. B) charged more. C) discharged. D) attracted.

Q: If a negatively charged object is brought near a suspended, positively charged object, the suspended object will be A) repelled. B) charged more. C) discharged. D) attracted.

Q: An insulator has a negative electric charge of 2.4 x 10-17C. How many electrons were added or removed?A) 150 electrons removedB) 67 electrons removedC) 150 electrons addedD) 67 electrons added

Q: An insulator has a positive electric charge of 4 x 10-17C. How many electrons were added or removed?A) 250 electrons removedB) 40 electrons removedC) 250 electrons addedD) 40 electrons added

Q: A(n) ______________ is an elementary particle with a charge of "1.6 x 10-19C.A) electronB) neutronC) protonD) atom

Q: A(n) ______________ is an elementary particle with no charge. A) electron B) neutron C) proton D) atom

Q: A(n) ______________ is an elementary particle with a charge of +1.6 x 10-19C.A) electronB) neutronC) protonD) atom

Q: A generator is a device that converts A) heat energy into mechanical energy. B) chemical energy into electrical energy. C) mechanical energy into electrical energy. D) electrical energy into mechanical energy.

Q: An ac voltage can be increased or decreased easily using a A) battery. B) transformer. C) fuse. D) motor. E) generator.

Q: A transformer with 400 turns on the primary coil is used to decrease the voltage from 3000 V to 120 V for home use. How many turns should be in the secondary coil? A) 400 turns B) 10000 turns C) 16 turns D) 3520 turns

Q: Consider a wire in a magnetic field, as shown in the following figure, with a current flowing downward through it. What will happen to the wire? A) The wire will be forced toward the north pole. B) The wire will be forced perpendicular to the plane of the magnetic field, into the page. C) The wire will be forced perpendicular to the plane of the magnetic field, out of the page. D) The current will cease flowing. E) The wire will be forced toward the south pole.

Q: Consider a wire in a magnetic field, as shown in the following figure, with a current flowing upward through it. What will happen to the wire? A) The wire will be forced toward the north pole. B) The wire will be forced perpendicular to the plane of the magnetic field, into the page. C) The wire will be forced perpendicular to the plane of the magnetic field, out of the page. D) The current will cease flowing. E) The wire will be forced toward the south pole.

Q: Consider a wire in a magnetic field, as shown in the following figure, with a current flowing through it. What will happen to the wire? A) The wire will be forced toward the north pole. B) The wire will be forced perpendicular to the plane of the magnetic field. C) The current will cease flowing. D) Nothing will happen.

Q: Consider a wire at rest in a magnetic field as shown in the following figure. What will happen to the wire? A) A current will flow in the wire. B) The wire will be pushed perpendicular to the plane of the magnetic field. C) The wire will be pushed toward the north pole. D) Nothing will happen.

Q: A motor converts A) electricity into magnetism. B) electrical energy into mechanical energy. C) mechanical energy into electrical energy. D) force into power.

Q: A ferromagnetic material loses this property above the ______________ temperature. A) domain B) Faraday C) Curie D) Coulomb

Q: The angle between true north and the direction in which a compass needle points is called the angle of A) attack. B) inclination. C) declination. D) dip.

Q: A ferromagnetic material is magnetized by the alignment of A) domains. B) atoms. C) single magnetic dipoles. D) poles.

Q: Earth's magnetic field A) results from a huge bar magnet within the planet. B) is believed to arise from currents within the planet's core. C) is always parallel to the planet's surface. D) is always in the same direction.

Q: The direction of the magnetic field of a bar magnet is A) in the direction opposite to that in which a compass would point. B) in any direction. C) away from the south pole. D) away from the north pole.

Q: The direction of the magnetic field of a bar magnet is A) in the direction opposite to that in which a compass would point. B) in any direction. C) toward the south pole. D) toward the north pole.

Q: The direction of the magnetic field of a bar magnet is A) in the direction a compass would point. B) in any direction. C) away from the south pole. D) toward the north pole.

Q: Magnetism results from A) the movement of magnetic particles. B) the movement of electric charge. C) Earth's magnetic field. D) the movement of magnetic charge.

Q: The source of magnetism is A) polarization. B) magnetic monopoles. C) electrons. D) protons.

Q: For electrical safety, A) electrical shocks caused by 1 A of current are of no concern. B) fuses or circuit breakers are wired in series in circuits. C) fuses larger than the rated value can be placed in a circuit. D) fuses and circuit breakers are wired in parallel in circuits.

Q: In a battery circuit with different resistors in parallel, A) the total resistance is larger than the value of the largest resistor. B) the current is the same through each resistor. C) the total resistance is larger than the value of the smallest resistor. D) the voltage is the same across each resistor.

Q: Three resistors, 80 W, 40 W, and 60 W, are wired in series and connected to a 120-V battery. How much current flows in this circuit? A) 0.67 A B) 6.5 A C) 2200 A D) 0.00063 A

Q: Three resistors, 10 W, 10 W, and 10 W, are wired in parallel and connected to a 120-V battery. How much current flows in this circuit? A) 4 A B) 36 A C) 400 A D) 0.12 A

Q: Three resistors, 60 W, 80 W, and 80 W, are wired in series and connected to a 120-V battery. What is the equivalent resistance for this circuit? A) 220 W B) 24 W C) 0.042 W D) 384000 W

Q: Three resistors, 40 W, 60 W, and 50 W, are wired in series and connected to a 120-V battery. What is the equivalent resistance for this circuit? A) 150 W B) 16 W C) 0.062 W D) 120000 W

Q: If the voltage across a resistor is quadrupled, the current will A) remain the same. B) be cut to one-quarter. C) be cut by one-quarter. D) be quadrupled. E) be multiplied by sixteen.

Q: If the voltage across a resistor is doubled, the current will A) remain the same. B) be cut to one-fourth. C) be cut in half. D) be doubled. E) be quadrupled.

Q: The electric company charges a home on the basis of consumption of A) resistance. B) energy. C) current. D) voltage. E) power.

Q: Voltage is defined as the ______________ per unit ______________. A) charge; current B) work; current C) charge; work D) work; charge

Q: A component in an automobile 12-V electrical system has a resistance of 90 W. How much energy is dissipated by the component each second? A) 0.63 J B) 1.6 J C) 7.5 J D) 0.13 J

Q: A component in an automobile 12-V electrical system has a resistance of 30 W. How much current is in the component when in operation? A) 42 A B) 0.4 A C) 2.5 A D) 360 A

Q: If work is done on an electric charge, a ______________ is present. A) resistance B) current C) voltage D) transformer E) bigger charge

Q: The electrical power dissipated in an appliance depends on A) voltage. B) current. C) resistance. D) all of these.

Q: The electrical power dissipated by a resistance Ris A) inversely proportional to I. B) directly proportional to I2. C) directly proportional to I. D) none of these.

Q: For an ohmic conductor, current is A) directly proportional to voltage. B) directly proportional to resistance. C) independent of resistance. D) independent of voltage.

Q: For an ohmic conductor, current is A) inversely proportional to voltage. B) inversely proportional to resistance. C) independent of resistance. D) independent of voltage.

Q: Which of the following would be the leastconductive? A) Copper B) Salt water C) Glass D) Mercury

Q: The abbreviation of the unit of resistance is

Q: The unit of resistance is called a(n) A) volt. B) ampere. C) coulomb. D) ohm. E) watt.

Q: One ampere one second is a unit of A) power. B) current. C) voltage. D) electric charge. E) resistance.

Q: In a conductor, what moves? A) Electrons B) Neutrons C) Quarks D) Protons

Q: Ohm's law gives the relationship between A) current and voltage. B) work and current. C) current and charge. D) force and current.

Q: The unit for current is the A) ampere. B) ohm. C) coulomb. D) volt.

Q: An object that is positively charged will A) repel a rubber rod stroked with fur. B) repel a glass rod stroked with silk. C) be polarized. D) none of these

Q: An object that is negatively charged will A) repel a rubber rod stroked with fur. B) repel a glass rod stroked with silk. C) be polarized. D) none of these

Q: An object that is positively charged will A) attract a rubber rod stroked with fur. B) attract a glass rod stroked with silk. C) be polarized. D) none of these

Q: An object that is negatively charged will A) attract a rubber rod stroked with fur. B) attract a glass rod stroked with silk. C) be polarized. D) none of these

Q: A system of a proton and an electron has a net charge ofA) +1.6 x 10-19 C.B) -1.6 x 10-19 C.C) 3.2 x 10-19 C.D) zero.

Q: A system of a proton and a neutron has a net charge ofA) +1.6 x 10-19 C.B) -1.6 x 10-19 C.C) 3.2 x 10-19 C.D) zero.

Q: A system of an electron and a neutron has a net charge ofA) +1.6 x 10-19 C.B) -1.6 x 10-19 C.C) 3.2 x 10-19 C.D) zero.

Q: A system of 8 electrons and 4 neutrons has a net charge ofA) -12.8 x 10-19 C.B) 12.8 x 10-19 C.C) -6.4 x 10-19 C.D) -8.0 x 10-19 C.E) 6.4 x 10-19 C.

Q: A system of 11 protons and 9 neutrons has a net charge ofA) 17.6 x 10-19 C.B) -17.6 x 10-19 C.C) 32.0 x 10-19 C.D) 11.0 x 10-19 C.E) -32.0 x 10-19 C.

Q: A system of 12 electrons and 11 protons has a net charge ofA) -1.6 x 10-19 C.B) 1.6 x 10-19 C.C) 16.0 x 10-19 C.D) -1.0 x 10-19 C.E) -16.0 x 10-19 C.

Q: A system of 16 electrons, 11 protons, and 4 neutrons has a net charge ofA) -8.0 x 10-19 C.B) 8.0 x 10-19 C.C) -1.6 x 10-19 C.D) -5.0 x 10-19 C.E) 1.6 x 10-19 C.

Q: A system of an electron, a proton, and a neutron has a net charge ofA) +1.6 x 10-19 C.B) -1.6 x 10-19 C.C) 3.2 x 10-19 C.D) zero.

Q: The mathematical form of Coulomb's law is similar to that of A) the second law of thermodynamics. B) the second law of motion. C) Kepler's second law. D) the law of gravitation.

Q: Electric charge is measured in units of A) coulombs. B) watts. C) volts. D) newtons.

Q: A double convex lens has a focal length of 0.10 m. An object 0.05 m high is placed 0.15 m from the lens surface on the principal axis. Sketch a ray diagram and give the characteristics of the image.

Q: A simple magnifying glass has a focal length of 6.0 cm. An object is placed 4.0 cm from it. Sketch a ray diagram and give the characteristics of the image.