Question 1

A 60-watt light bulb carries a current of 0.5 ampere. The total charge passing through it in one hour is:

Accepted Answer

A)  120 C 
B)  3600 C 
C)  3000 C 
D)  2400 C 
E)  1800 C 
A)  120 C 
B)  3600 C 
C)  3000 C 
D)  2400 C 
E)  1800 C

Question 2

Current has units:

Accepted Answer

A)  kilowatt·hour 
B)  coulomb/second 
C)  coulomb 
D)  volt 
E)  ohm 
A)  kilowatt·hour 
B)  coulomb/second 
C)  coulomb 
D)  volt 
E)  ohm

Question 3

The mechanical equivalent of heat is 1 cal = 4.18 J. The specific heat of water is 1 cal/g·K. An electric immersion water heater, rated at 400 W, should heat a liter of water from 10 $\degree$C to 30 $\degree$C in about:

Accepted Answer

A)  3.5 min 
B)  1 min 
C)  15 min 
D)  45 min 
E)  15 s 
A)  3.5 min 
B)  1 min 
C)  15 min 
D)  45 min 
E)  15 s

Question 4

A flat iron is marked "120 volt, 600 watt". In normal use, the current in it is:

Accepted Answer

A)  2 A 
B)  4 A 
C)  5 A 
D)  7.2 A 
E)  0.2 A 
A)  2 A 
B)  4 A 
C)  5 A 
D)  7.2 A 
E)  0.2 A

Question 5

The resistance of a rod does NOT depend on:

Accepted Answer

A)  its temperature 
B)  its material 
C)  its length 
D)  its conductivity 
E)  shape of its (fixed) cross-sectional area 
A)  its temperature 
B)  its material 
C)  its length 
D)  its conductivity 
E)  shape of its (fixed) cross-sectional area

Question 6

A certain wire has resistance R. Another wire, of the same material, has half the length and half the diameter of the first wire. The resistance of the second wire is:

Accepted Answer

A)  R/4 
B)  R/2 
C)  R 
D)  2R 
E)  4R 
A)  R/4 
B)  R/2 
C)  R 
D)  2R 
E)  4R

Question 7

A car battery is rated at 80 A. h. An ampere-hour is a unit of:

Accepted Answer

A)  power 
B)  energy 
C)  current 
D)  charge 
E)  force 
A)  power 
B)  energy 
C)  current 
D)  charge 
E)  force

Question 8

A wire with a length of 150 m and a radius of 0.15 m carries a current with a uniform current density of 2.8 *107 A/m2. The current is:

Accepted Answer

A)  0.63 A2 
B)  2.0 A 
C)  5.9 A2 
D)  296 A 
E)  400 A2 
A)  0.63 A2 
B)  2.0 A 
C)  5.9 A2 
D)  296 A 
E)  400 A2

Question 9

For an ohmic substance the resistivity is the proportionality constant for:

Accepted Answer

A)  current and potential difference 
B)  current and electric field 
C)  current density and potential difference 
D)  current density and electric field 
E)  potential difference and electric field 
A)  current and potential difference 
B)  current and electric field 
C)  current density and potential difference 
D)  current density and electric field 
E)  potential difference and electric field

Exam 26: Current and Resistance

A 60-watt light bulb carries a current of 0.5 ampere. The total charge passing through it in one hour is:

Current has units:

The mechanical equivalent of heat is 1 cal = 4.18 J. The specific heat of water is 1 cal/g·K. An electric immersion water heater, rated at 400 W, should heat a liter of water from 10 °\degree° C to 30 °\degree° C in about:

A flat iron is marked "120 volt, 600 watt". In normal use, the current in it is:

The resistance of a rod does NOT depend on:

A certain wire has resistance R. Another wire, of the same material, has half the length and half the diameter of the first wire. The resistance of the second wire is:

A car battery is rated at 80 A. h. An ampere-hour is a unit of:

A wire with a length of 150 m and a radius of 0.15 m carries a current with a uniform current density of 2.8 *107 A/m2. The current is:

For an ohmic substance the resistivity is the proportionality constant for:

Measurement

Motion Along a Straight Line

Vector

Motion in Two and Three Dimensions

Force and Motion I

Force and Motion II

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

Rolling, Torque, and Angular Momentum

Equilibrium and Elasticity

Gravitation

Fluids

Oscillations

Waves I

Waves II

Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Electric Charge

Electric Fields

Gauss Law

Electric Potential

Capacitance

Circuits

Magnetic Fields

Magnetic Fields Due to Currents

Induction and Inductance

Electromagnetic Oscillations and Alternating Current

Maxwells Equations; Magnetism of Matter

Electromagnetic Waves

Images

Interference

Diffraction

Relativity

Photons and Matter Waves

More About Matter Waves

All About Atoms

Conduction of Electricity in Solids

Nuclear Physics

Energy From the Nucleus

Quarks, Leptons, and the Big Bang

Filters

The mechanical equivalent of heat is 1 cal = 4.18 J. The specific heat of water is 1 cal/g·K. An electric immersion water heater, rated at 400 W, should heat a liter of water from 10 $\degree$ C to 30 $\degree$ C in about:

A wire with a length of 150 m and a radius of 0.15 m carries a current with a uniform current density of 2.8 *10⁷A/m². The current is: