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Unit 5 Physics Study Guide
Terms in this set (42)
What are insulators?
materials that resist the flow of electricity and do not permit the movement of charges
What is a circuit?
an unbroken loop of electrical components that forms a continuous conducting path
If a particle with a charge of +2.65 C is attracted to another particle by a force of 5.0 N, what is the strength of the electric field at this location?
A) 1.9 N/C
B) 2.4 NC
C) 0.53 N/C
D) 13 NC
An electrical circuit needs which of the following to light up a light bulb.
A) a switch after every light bulb
B) material that allows charge to flow freely
C) at least two light bulbs
D) a switch
material that allows charge to flow freely
The distance between two particles is 2 centimeters. If the distance is increased to 4 centimeters, the force will be _____.
A) LESS .......... one-half as much
B) LESS .......... one-fourth as much
C) MORE .......... two times as much
D) MORE .......... four times as much
Less ... one-fourth as much
How much force does a charge of 200 coulombs exert on a 33 coulomb charge that is 1.5 meters away?
A) 0.66 N/C
B) 28 NC
C) 2.2 NC
D) 1.5 N/C
Consider the electric force between a pair of charged particles a certain distance apart. By Coulomb's Law, if the charge on one of the particles is tripled, the force is _____.
A) LESS ..........one-half as much
B) MORE ..........two times as much
C) MORE .......... three times as much
D) LESS .......... one-third as much
More ... three times as much
What is the force per charge (F/q) called?
If the direction of a magnetic field around a vertical electrical wire is counter clockwise, what direction is the electrical current moving?
A) Counter clockwise
C) From the bottom of the wire to the top
D) From the top of the wire to the bottom
From the bottom of the wire to the top
In a circuit with a battery, in which direction do electrons flow in the wire?
A) From the positive to the negative terminal
B) From the positive to the positive terminal
C) From the negative to the negative terminal
D) From the negative to the positive terminal
From the negative to the positive terminal
What causes the occasional shift in the needle of a compass?
A) Sources of electrical current
B) Changes in pressure
C) Changes to Earth's magnetic field
D) Changes in temperature
Sources of electrical current
A light bulb provides a resistance of 20 Ω to the 0.30 A current that runs through it. Determine the voltage of the battery in the flashlight.
A) 51 V
B) 2 V
C) 0.7 V
D) 6 V
A hair dryer draws 10.0 A when plugged into a 120-V line. What happens to the current when the same hair dryer is plugged into a 240-V line?
A) The current doubles in size
B) The current becomes 4 times stronger
C) The current stays the same
D) The current becomes half what it was
The current doubles in size
Kristina goes on vacation to another country. When Kristina plugs in the lamp she brought from home, the bulb is very dim. Which statement best explains why?
A) Voltage does not affect the bulb brightness
B) Voltage at the vacation home is too high
C) Voltage at the vacation home is too low
D) The lamp is not plugged in
Voltage at the vacation home is too low
An electrical current travels through a wire. Which of the following would you expect?
A) A magnetic field parallel to the wire
B) An electrical charge radiating perpendicular to the wire
C) Nothing around the wire, the wire is insulated
D) A magnetic field around the wire
A magnetic field around the wire
One light bulb has a resistance of 100 Ω and a second bulb has a resistance of 120 Ω. If the same voltage is supplied, which bulb would have more current through it?
A) The lower resistance will have higher current
B) The higher resistance will have higher current
C) Current is the same for both bulbs
The lower resistance will have higher current
All countries have the same outlet voltage.
What does magnetic effect of current mean?
a current in a wire produces a magnetic field around it
The direction of the conventional current is ___ the flow of the electrons
Where do we get the electricity that we use? We can make it with a ______
When a generator spins, you get _____
A) an electric current
B) a generon
C) a photon
an electric current
A generator is made from a(n)________ like a coil of copper and a magnet.
Natural forces of the earth that have been used to generate electricity, as explained in the video, include hydroelectric power and ___
A) gasoline power
B) tidal power
C) biofuel power
How many volts is needed to power one's house in America?
A) 2.4 V
B) 110-120 V
C) 18 V
Turning the generator using the long handle produced_______ using their hand.
A) the same as
B) more than
C) less than
the same as
Turning the generator with no handle produced ___
B) 14 V
C) 2.4 V
Solar Power to generate electricity: Use the sun - to ____ as demonstrated using a ________.
A) turn the generator ..... ferris wheel
B) keep the generator very still .......... seesaw
C) do something different than spin the generator .......... bathtub
do something different than spin the generator .... bathtub
What can capacitors do?
A) Act the same as a battery
B) Store electrical energy
C) Never need a battery again
D) Make batteries stronger
store electrical energy
The capacitor in a clock radio can ________
A) produce music
B) cover and protect the outside of the unit
C) give off light to see the numbers
D) run the clock when it loses power
run the clock when it loses power
What is the role of a capacitor in a monitor?
A) To create the flashes that make up the images on our screen
B) To turn the monitor on and off
C) To program the monitor to record
D) To increase the resolution on the monitor
To create the flashes that make up the images on our screen
Resistance in a circuit is always a bad thing because it opposes current.
A) False - because resistance increases current
B) False - because resistance can help sometimes
C) True - because resistance always makes circuits too slow
False - because resistance can help sometimes
A flashlight bulb is connected to a dry cell of voltage 2.25 V. It draws 0.0350 A. What is its resistance?
A) 15.6 ohm
B) 78.8 ohm
C) 64.3 ohm
D) 37.3 ohm
What current does a 175 ohm resistance draw on 220 volts?
A) 0.75 A
B) 4.0 A
C) 3.5 A
D) 1.3 A
Which of the following would decrease the resistance in a wire?
A) Decrease the thickness of the wire
B) Increase the mass of the wire
C) Increase the mass of the wire
D) Decrease the mass of the wire
Increase the mass of the wire
The ability of a bulb filament to hinder the flow of charge through itself is called _________
Any circuit component that hinders the flow of charge through itself is called _______
For a parallel circuit with three light bulbs, when one bulb is unscrewed what happens?
A) The unscrewed bulb will not light and the other bulbs will light
B) All three bulbs will light
C) One bulb will light and two bulbs will not light
D) All three bulbs will not light
The unscrewed bulb will not light and the other bulbs will light
For a circuit with three light bulbs, is it possible to have two bulbs lit while one is not lit?
A) Yes - both 3 bulbs in a series or 3 bulbs in a parallel circuit will work, with one unscrewed
B) No - neither 3 bulbs in a series nor 3 bulbs in a parallel will work
C) Yes - 3 bulbs in a Parallel circuit with one bulb unscrewed
D) Yes - 3 bulbs in a Series circuit with one unscrewed
Yes - 3 bulbs in a Parallel circuit with one bulb unscrewed
The current through two resistors in SERIES is _______
A) greater than with 1 resistor
B) less than with 1 resistor
C) the same as with 1 resistor
less than with 1 resistor
Adding an second resistor in series is like adding a second funnel after the first.
Therefore the overall RESISTANCE with two resistors in SERIES is _______
A) less than with 1 resistor
B) the same as with 1 resistor
C) more than with 1 resistor
more than with 1 resistor
If a small amount of amps is needed to run an appliance, one can use a cord with higher resistance such as ______
A) thick and thin cords have the same resistance, if they are the same length
B) a thin cord
C) a thick cord
a thin cord
An extension cord should be as _______ as possible because _____
A) short - it will decrease the current
B) long - it will reduce the resistance
C) short - it will reduce the resistance
D) long - resistance does not depend on length
short - it will reduce the resistance
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