Physics 1410-Review Chapter 13

An ampere is a unit of electric A) current. B) resistance. C) voltage.

A Current

An ohm is equal to which of these? A) A volt per ampere. B) An ampere per second. C) A Coulomb per second. D) A volt.

A a volt per ampere

Direct current is normally produced by a A) battery. B) generator. C) both of these D) neither of these

A battery

For electric current in the home, your power company supplies A) energy. B) electrons. C) both of these D) neither of these

A energy

The cause of electrical shock is predominantly A) excess voltage. B) reduced resistance. C) excess current. D) none of the above

A excess

Heat a copper wire and its electric resistance A) increases. B) remains unchanged. C) decreases.

A increases

The resistance of a 50 watt bulb is ________ that of a 100 watt bulb, if both run on the same voltage. A) one half B) four times C) double D) one fourth

A one half

The current (measured in amperes) in a circuit is A) the amount of charge (measured in Coulombs) that passes a point (in the circuit) in 1 second. B) the amount of the total energy carried by 1 Coulomb of charge. C) never lethal if the current is due to positive charges. D) the total number of electrons in the circuit.

A the amount of charge (measured in Coulombs) that passes a point (in the circuit) in 1 second.

A 12 ohm resistor and a 24 ohm resistor are connected in series with a 6.0 V battery. The correct statement is A) the current in each resistor is the same. B) the smaller resistor carries the larger current. C) the voltage difference between the ends of each resistor is the same. D) the power dissipated in each resistor is the same.

A the current in each resistor is the same.

The resistance of a circuit element is a measure of A)the ratio of the voltage difference between element ends to the current in the element. B) the amount of work that an electron can perform. C) the total energy of the charges in the circuit element. D) the size of the circuit.

A the ratio of the voltage difference between element ends to the current in the element.

The alternating current in wide use in homes in North America is 60 cycles per second, or 60 Hz. How many times per minute does this current reverse its direction of travel? A) 60 times. B) 7200 times. C) 3600 times. D) 120 times. E) none of these.

B 7200 times

Two lamps with different filament thicknesses, and therefore different resistances, are connected in series. Greater current is in the lamp with the A) thin filament. B) same in each C) thick filament.

B Same in each

If an electric toaster rated at 110 V is accidently plugged into a 220-V outlet, the current drawn by the toaster will be A) the same as its normal value. B) twice its normal value. C) half its normal value. D) none of the above

B Twice its normal value

Electrons flow in a wire when there is A) a difference in potential energy across its ends. B) a potential difference across its ends. C) an imbalance of charges in the wire. D) none of the above

B a potential difference across its ends

Current that is typically 60 hertz is A) direct current. B) alternating current. C) either of these D) neither of these

B alternating current

An electric diode is useful for A) boosting voltage. B) changing ac to dc. C) voltage modification. D) limiting current. E) storing electrical energy.

B changing ac to dc

What is the best way to ensure that a 40 watt bulb and a 60 watt bulb have the same voltage applied to them? A) Connect the bulbs in series with the power supply. B) Connect the bulbs in parallel with the power supply. C) It can't be done: different wattage bulbs must always have different voltages.

B connect the bulbs in parallel with the power supply

What is the best way to ensure that a 40 watt bulb and a 60 watt bulb have the same current within them? A) Connect the bulbs in parallel with the power supply. B) Connect the bulbs in series with the power supply. C) It can't be done: different wattage bulbs must always have different currents

B connect the bulbs in series with the power supply.

One kilowatt-hour is a unit of A) power. B) energy. C) voltage. D) current. E) resistance.

B energy

Alternating current is normally produced by a A) battery. B) generator. C) both of these D) neither of these

B generator

When you turn on a lamp, the initial current in its filament is greater at first, rather than a moment later, which indicates A) a time delay for current attaining its average speed. B) increased temperature means increased resistance. C) nothing of interest D) something is faulty.

B increased temperature means increased resistance

A flashlight bulb typically has a small metallic button at one end, and this button is surrounded by ceramic material. The chief purpose of the ceramic material is to A) shut the filament off if the current gets too high. B) insulate the metal button from the other contact point. C) provide extra mass at the bottom of the bulb. D) provide a conducting path to the filament

B insulate the metal button from the other contact point.

If two copper wires of the same length have different thickness, then the thicker wire has A) more resistance. B) less resistance. C) both the same

B less resistance

Two light bulbs are connected to a battery, one at a time. The bulb that draws more current has the A) higher resistance, but is dimmer. B) lower resistance, and is brightest. C) lower resistance, but is dimmer. D) higher resistance, and is brightest. E) none of the above

B lower resistance and is brightest

Electric resistance in our skin is lowered when our skin is A) dry. B) moist. C) none of the above

B moist

A suitable electric pump in an electric circuit is a A) generator. B) chemical battery. C) both of these D) neither of these

C Both of these

Two identical lightbulbs are installed in two sockets connected in parallel and power is then applied to the combination so that both bulbs light. If one of the bulbs is then removed from its socket, the other one will A) get dimmer. B) go out. C) remain equally bright. D) get brighter.

C Remain equally bright

Just as a sustained flow of water in a hydraulic circuit needs a pump, in electric circuits the flow of charge needs A) current. B) resistance. C) voltage.

C Voltage

Ohm's law tells us that the amount of current produced in a circuit is A) inversely proportional to resistance. B) directly proportional to voltage. C) both of these D) neither of these

C both of these

The unit of electrical resistance is the A) ampere. B) volt. C) ohm. D) none of the above

C ohm

A person discovers that the 5 ampere fuse in his car's brake light circuit is blown. Not having a spare 5 ampere fuse available, he replaces it with a new 10 ampere fuse. What is likely to happen as he uses the brakes? A) The brake lights shine more dimly than before. B) Nothing bad happens; everything works well for a long time. C) The circuit overheats and the brake lights do not work. D) The fuse blows immediately.

C the circuit overheats and the brake lights do not work.

A 12 ohm resistor and a 24 ohm resistor are connected in parallel across a 6.0 V battery. The correct statement from the following is A) the power dissipated is the same in each resistor. B) the larger current is in the larger resistor. C) the voltage difference between the ends of each resistor is the same. D) the current is the same in each resistor.

C the voltage difference between the ends of each resistor is the same.

One ampere is equivalent to A) 1 V/m. B) 1 ohm/volt. C) 1 J/s. D) 1 C/s. E) 1 N/C.

D 1 N/C

If you load up a circuit in your home with too many devices, like lightbulbs or stereos, in ________, then you can overload the circuit and trip a circuit breaker or blow a fuse. A) duplicate B) series C) summer D) parallel

D parallel

In many ways, an electric circuit is like the plumbing system in your home. The voltage on an electric circuit corresponds to the ________ in a plumbing system. A) drain B) trap C) faucet or valve D) pressure

D pressure

When you pay your electric bill, what are you paying for, exactly? A) The electrical power you used the previous month. B) The voltage you used the previous month. C) The electrical charge you used the previous month. D) The electrical energy you used the previous month. E) None of these.

D the electrical energy you used the previous month.

One kilowatt is a unit of A) current. B) voltage. C) energy. D) resistance. E) power.

E power

The unit for electromotive force (emf) is A) N. B) ohm. C) N/C. D) A. E) V.

E v