Deck 3: Electricity

Question 1

Electric current is defined as

A)time/charge.
B)charge/time.
C)(charge)(time).
D)charge/time².

Answer 1

charge/time.

Question 2

A current of 2 amperes and a resistance of 8 ohms require what voltage in a series circuit?

A)1/16 volt
B)1/4 volt
C)4 volts
D)16 volts

Answer 2

16 volts

Question 3

A circuit has a current of 2 amperes and a resistance of 4 ohms.The maximum power that can be delivered is

A)16 watts.
B)8 watts.
C)2 watts.
D)1/2 watt.

Answer 3

16 watts.

Question 4

A 100 W light bulb with an amperage of 0.91 A is operating at a potential difference of

A)110 volts.
B)100 volts.
C)11 kilovolts.
D)110 ohms.

Question 5

If the distance between two electrical charges is doubled, the force between them is

A)decreased by 1/4.
B)decreased by 1/2
C)doubled.
D)quadrupled.

Question 6

If the total resistance in a circuit is 9 ohms and the total voltage is 3 volts, the current is

A)1/27 ampere.
B)1/3 ampere.
C)3 amperes.
D)27 amperes.

Question 7

Electric potential is measured in

A)coulombs.
B)joules.
C)volts.
D)ohms.

Question 8

If a DC circuit is

A)in series, the currents are different for each component (e.g., resistors).
B)in series, the voltages are the same for each component.
C)in parallel, the currents are equal for all paths of the circuit.
D)in parallel, the voltages are equal for all paths of the circuit.

Question 9

Resistance is

A)the opposition to the flow of electrons.
B)the opposition to the generation of electromotive force.
C)the location of storage of electrons.
D)measured in amperes.

Question 10

An ampere is

A)coulomb/sec.
B)(coulomb)(sec).
C)(volt)(ohm).
D)ohm/volt.

Question 11

Electric insulators

A)convert electrical energy into heat.
B)consist of materials like silicon.
C)inhibit movement of electrical charge.
D)permit movement of electrical charge.

Question 12

When an electric current flows through a wire with resistance, energy is

A)liberated as x-rays.
B)liberated as heat.
C)liberated as light.
D)absorbed as heat.

Question 13

A charge would lose most of its energy when it passes through a

A)resistor.
B)battery.
C)generator.
D)all of the above

Question 14

When the atomic valence and conductance bands overlap,

A)an insulator is created.
B)electrical flow easily occurs.
C)electrical flow is inhibited.
D)Ohm's law no longer applies.

Question 15

Coulomb's law of electrical forces is mathematically described as

A)F = q₁q₂/r².
B)F = q/r^2..
C)F = q₁q₂/r.
D)F = q₂/r.

Question 16

If 20 volts of potential difference causes a current of 5 amperes to flow in a parallel circuit, the resistance produced is

A)1/100 ohm.
B)1/4 ohm.
C)4 ohms.
D)100 ohms.

Question 17

The unit of electrical power is

A)joule.
B)volt.
C)ampere.
D)watt.

Question 18

The charge on each of two objects is doubled, and they are moved twice as far apart.The force between them is

A)increased by a factor of 4.
B)increased by a factor of 2.
C)increased by a factor of 1/2.
D)unchanged.

Question 19

The resistance in a wire decreases as its

A)diameter increases.
B)diameter decreases.
C)temperature increases.
D)surface area decreases.

Question 20

Ohm's law is mathematically described as

A)C = Q/V.
B)L = -V/It.
C)R = V/I.
D)V = I²R.

Question 21

Calculate the current supplied to a circuit with two resistances of 3 and 5 ohms in series and two resistances of 4 ohms each in parallel.

Question 22

Neon lights illustrate the fact that electrons will flow

A)in a gaseous environment.
B)in a vacuum.
C)in an ionic solution.
D)in a solid conductor.

Question 23

If 10 coulombs pass a point in 2 seconds, the current is

A)0.20 amp.
B)5 amps.
C)20 amps.
D)200 amps.

Question 24

All of the following choices are considered good metallic electrical conductors EXCEPT

A)gold.
B)silver.
C)carbon.
D)copper.

Question 25

Match the terms relating to electricity with the correct statement.
superconductor

A)electron
B)neutron
C)proton
D)binding energy
E)kinetic energy
F)atomic mass
G)atomic number
H)isotope

Question 26

What is the total resistance of a circuit with two resistances of 3 and 5 ohms in series and two resistances of 4 ohms each in parallel?

Question 27

If a conductor is positively charged, it

A)has too many electrons.
B)is deficient in electrons.
C)has more neutrons than electrons.
D)is deficient in protons.

Question 28

If a circuit has potential difference of 80 kV and a current of 400 mA, what is the resistance?

Question 29

In a parallel circuit,

A)Ohm's law does not apply.
B)total current flow is equal across its parallel branches.
C)the voltage is equal across all branches of the circuit.
D)as more resistors are added total resistance increases.

Question 30

A 25 watt lightbulb operates on 120-volt household voltage.How much current does the lightbulb draw?

Question 31

A 100 watt lightbulb operates on 120-volt household voltage.How much resistance does the lightbulb offer?

Question 32

The milliampere(mA) is a unit of

A)EMF.
B)voltage.
C)current.
D)potential difference.

Question 33

The current flow from a dry cell battery source would be

A)direct current.
B)alternating current.
C)variable current.
D)oscillating current.

Question 34

When 6.24 x 10¹⁸ electrons travel in one second producing a joule (j) of work,

A)one volt has been created.
B)one ohm has traveled through the circuit.
C)an ampere of resistance has been created.
D)alternating current has been generated.

Question 35

Match the terms relating to electricity with the correct statement.
a device to control resistance

A)electron
B)neutron
C)proton
D)binding energy
E)kinetic energy
F)atomic mass
G)atomic number
H)isotope

Question 36

Match the terms relating to electricity with the correct statement.
an expression of electrical power

A)electron
B)neutron
C)proton
D)binding energy
E)kinetic energy
F)atomic mass
G)atomic number
H)isotope

Question 37

Electrical components possess a negative and a positive side.This polarity permits the application of

A)resistance across the poles to inhibit electron flow.
B)an electromotive force (emf) to enable current flow.
C)a spark gap to check amperage.
D)all of the above

Question 38

Parallel resistors of 3 ohms and 6 ohms would result in a total resistance of how many ohms?

Question 39

Match the terms relating to electricity with the correct statement.
receiving an electrical shock from touching a doorknob

A)electron
B)neutron
C)proton
D)binding energy
E)kinetic energy
F)atomic mass
G)atomic number
H)isotope

Question 40

In a battery circuit with several resistors of different values connected in series,

A)the voltage drop is the same across all the resistors.
B)the current through each resistor is different.
C)the power dissipated through each resistor is the same.
D)none of the above

Question 41

Match the terms relating to electric current flow with the correct statement.
Z = 32

A)semiconductor
B)conductor
C)insulator
D)ampere
E)volt
F)Ohm's law
G)series circuit
H)parallel circuit

Question 42

Match the terms relating to electricity with the correct statement.
the production of lightning

A)electron
B)neutron
C)proton
D)binding energy
E)kinetic energy
F)atomic mass
G)atomic number
H)isotope

Question 43

Match the terms relating to electric current flow with the correct statement.
10V + 5V + 12V + 3V = 30V

A)semiconductor
B)conductor
C)insulator
D)ampere
E)volt
F)Ohm's law
G)series circuit
H)parallel circuit

Question 44

Match the terms relating to electricity with the correct statement.
silicon

A)electron
B)neutron
C)proton
D)binding energy
E)kinetic energy
F)atomic mass
G)atomic number
H)isotope

Question 45

The shape of door knobs has been an ever-changing process over the history of architecture and home design.A popular door opener design currently used is a flat, lever-type handle that you can use to open a door.Aside from the aesthetic issues, the flat design is intended to take advantage of what law of electrostatics?

Question 46

Match the terms relating to electric current flow with the correct statement.
I_t = I₁ + I₂ + I₃ + I_n

A)semiconductor
B)conductor
C)insulator
D)ampere
E)volt
F)Ohm's law
G)series circuit
H)parallel circuit

Question 47

Match the terms relating to electric current flow with the correct statement.
a wide band gap

A)semiconductor
B)conductor
C)insulator
D)ampere
E)volt
F)Ohm's law
G)series circuit
H)parallel circuit

Question 48

Match the terms relating to electric current flow with the correct statement.
V = I x R

A)semiconductor
B)conductor
C)insulator
D)ampere
E)volt
F)Ohm's law
G)series circuit
H)parallel circuit

Question 49

Match the terms relating to electric current flow with the correct statement.
6.24 x 10¹⁸ electrons /sec

A)semiconductor
B)conductor
C)insulator
D)ampere
E)volt
F)Ohm's law
G)series circuit
H)parallel circuit