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Physics 4-26

QuestionAnswer
The charge of an electron is Negative
Atomic Nuclei of almost all elements consist of Protons and neutrons
Two like charges repel each other
Protons and electrons attract each other
The fundamental force underlying all chemical reactions is Electrical
Electrical forces between charges are strongest when the charges are close together
Coulombs law says that the force between any two charges depends Both A and B
Two charges are separated by a certain distance. If the magnitude of each charge is doubled, the force on each charge is Quadrupled
When the distance between two charges is halved, the electrical force between the charges Quadruples
The net charge of a non ionized atom is zero
A positive ion has more protons than electrons
If you comb our hair and the comb becomes positively charged, your hair becomes Negatively charged
In a good insulator, the electrons are usually Semi-free to move around
Objects can be charged by All of the above
Charge carriers in metal are electrons rather the protons, because electrons are all of the above
To be safe in the unlikely case of a lighting strike, it is best to be inside a building framed with steel
A negatively charged rod is brought near a metal can the rests on a wood table. You touch the opposite side of the can momentarily with your finger. The can is then positively charged
An electroscope is charged positively, as shown by foil leaves that stand apart. As a negatively charged rod is brought close to the electroscope, the leaves move closer together
Lighting bolts occur between Both A and B
When a charged cloud passes overhead, the ground below is charged by Induction
Bring a charged object near a conductor and then momentarily touch the conductor. This demonstrates charge by induction
The reason a charged balloon will stick to a wall is that induced opposite charged in the wall are closer than the other wall charges
Two charged particles held close to each other are released, as they move, the force on each particle increases. therefore, the particles have opposite signs
Two charged particles held close to each other are released. As the particles move, teh velocity of each increases. Therefore, the particles have charges that cannot be determined
A positive charge and a negative charge held near each other are released. As they move, the force on each particle Increases
Two charged particles held near each other are released. As they move, the acceleration of each decreases. Therefore,t he particles have The same signs
The SI unit of charge is the Coulomb
Particle A has twice as much charge as particle B. Compared to the force on particle A, the force on particle B is the same
The electrostatic force between two charges located 8 meters apart is 0.10 N. What will the force between these charges when they are located 2 meters apart? 1.6 N
A 2-C charge and a 4-C charge attract each other with a 10 N of force. How much will a 2-C charge and a 12-C charge attract each other when placed the same distance apart? 60 N
Two charges separated a distance of 1.0 meter exert a 10-N force on each other. If the charges are pushed to a separation of 1/3 meter, the force on each will be 18.0 N
two charges separated by a distance of 1 meter exert a 20-N force on each other. If the charges are pulled to a 2 meter separation distance, the force on each charge will be 5 N
Two charges separated by a distance of 1 meter exert a 2-N fore on each other. If the magnitude of each charge is doubled, the force on each charge is 8 N
In order for there to be a flow of charge from one place to another, there must be a Both A and B
In solid conductors, electric current is the flow of electrons
Electrons move in an electric circuit... by interacting with an established electric field
An ampere is a Unit of current
An example of a voltage source is All of the above
Electrical resistance in a wire depends on the wires All of the above
Electrical resistance in a wire depends on the wire's All of the above
COMPARED TO THIN WIRES, ELECTRICAL RESISTANCE IN THICK WIRES IS less
For most conductors, as their temperature increases, their resistance increases
electrical resistance is measured in none of the above
A woman experiences an electrical shock. The electrons making the shock come from the woman's body
while you are standing on the ground in your running shoes, the greatest resistance between you and the ground is in the running shoes
The primary reason a bird can perch harmlessly on a bare high voltage wires is that There is no potential difference across the birds feet.
Alternating current is made by alternating he direction of voltage of the power source.
The frequency of AC current in North America is 60 hertz
Current from a battery is always DC
Where do the electrons come from that produce heat and light in a light bulb? the bulbs wire filament
In 2004, the number of electrons to an average American home by an average power utility was Zero
When we say an appliance uses up electricity, we really are saying that electron kinetic energy is changed into heat and other forms of energy
If you plug an electric toaster rated at 110 V into a 220 V outlet, current in the toaster will be Twice what it should be
The resistance of your dry skin is usually around 100,000 ohms
Electric power is defined as current times voltage
Compared to the filament thickness on a 60 W light bulb, the filament thickness of a 100 W light bulb will be greater
Power outlets in our home typically have a potential difference of 120 V
When an 8 V battery is connected to a resistor, 2 A of current flows in the resistor. What is the resistors value? 4 ohms
The current through a 5 ohm resistor connected to a 150 V power supply is 30 A
A 15 ohm resistor has a 5 A current in it. What is the voltage across the resistor? more than 25 V
What is the resistance of a toaster that uses 5 A of current when connected to a 120 V power source? 24 ohms
When connected to a 110 V power supply, how much current is in a light bulb that has a resistance of 220 ohms? 0.5 A
If you accidentally grabbed the prongs of a partially plugged in 120 V electrical plug on a day when your skin resistance was 130,000 ohms, how much current would pass through your body? .0009 A
How much power is used by a 12.0V car battery that draws 0.5 A of current? 6W
When plugged into a 120 V wall outlet, how much current is used by an electric blanket rated at 140W? 1.2 A
A 120 Watt light bulb is connected to a 120 V outlet. how much current is in the light bulb? 1 A
A light bulb is plugged into a 120 V outlet and has a 0.7 A current in it. What is the power rating of the light bulb? 84 W
A 60 W light bulb and a 100 W light bulb are both rated at 120 V. Which light bulb has the larger resistance? the 60 W bulb
A 60 W light bulb and a 100 W light bulb are each connected to a 130 V outlet. Which bulb has more current in it? the 100 W bulb
An electric heater is rated at 300 W for use in a 100 V circuit. The circuit breaker in the circuit can handle 12 A of current. How many heater can be safely operated in the circuit? 4
A heater uses 21 A when connected to a 110V line. If the electric power costs 10 cents per kilowatt-hour in the location, the cot of running the heater for 13 hours is ____? $3.000
A power line with a resistance of 9 ohms has a current of 80 A in it. The power dissipated in the line is 57,600 W
Suppose energy costs $0.09 per kilowatt-hour. How much would it cost to keep a 40 Watt porch light on all night every night for one month (average month = 30, average night = 10) $1.08
how much voltage is required to make 4 amperes flow through a 12 ohm resistor? 48 Volts
A battery does 18J of work on 10 coulombs of charge. What voltage does the battery supply? 1.8 V
What is the current in a 60W bulb connected to a 120V source? 0.5 Amps
What is the power dissipated by a toaster that has a resistance of 40 ohms and is plugged into a 120 V outlet? 360 Watts
A certain bulb with a resistance of 240 ohms is labeled 60 W. For what voltage circuit was this bulb designed? 120 Volts
In order to form a electric circuit, you need to have All of the above
In order for a current to flow in a circuit, you must have A complete path for the current
Electrical resistance is measured in None of the above
A closed circuit is a circuit in which charge can flow
When two light bulbs are connected in a series, the same amount of current always flows through each bulb
The symbol used to represent resistance in a schematic diagram is a zigzag line
When resistors are put in a series next to each other, their overall resistance is Larger than the resistance of any individual resistor
When resistors are put in a parallel next to each other, their overall resistance is Smaller then the resistance of any of the resistors.
As more lamps are put into a series circuit, the overall current in the circuit decreases
As more lamps are put into a parallel circuit, the overall current in the circuit increases
Compared to the resistance of 2 resistors connected in series, the same two resistors connected in parallel have less resistance
When one light bulb in a series circuit containing several light bulbs burns out, the other light bulbs none of the other bulbs will light up
When one light bulb in a parallel circuit containing several light bulbs burns out, the other light bulbs burn the same as before
In a simple parallel circuit voltage across each branch is always the same
In a simple parallel circuit all of the above
Electrical devices in our homes are connected in Parallel
Fuses and circuit breakers are used to all of the above
A short circuit occurs when the positive wire is connected directly to the negative wire
Two lamps, one with a thick filament and one with a thin filament, are connected in a parallel to a battery. The voltage is greater across the lamp with the Both voltages are the same
Two lamps, one with a thick filament and one with a thin filament, are connected in a parallel to a battery. The current is larger in the lamp with the Thick filament
Two lamps, one with a thick filament and one with a thin filament, are connected in a series to a battery. The voltage is greater across the lamp with the thin filament
A 60 W light bulb is connected to a 12 V car battery. When another 60 W light bulb is connected in parallel with the first bulb, the battery output energy doubles
The total resistance of a 10 ohm resistor and a 7 ohm resistor in series is 17 ohms
The total resistance of a 6ohm resistor and a 12 ohm resistor in a parallel is 4 ohms
A 60 W light bulb and a 100 W light bulb are both connected in parallel to a 120 V outlet. Which bulb has more current in it? The 100 W light bulb
The current through 2 identical light bulbs connected in series is .25 A. The total voltage across both bulbs is 120 V . the resistance of a single light bulb is 240ohms
How many 6 ohm resistors must be connected in parallel to create an equivalent resistance of 1 ohm? 6
What is the equivalent resistance of a 30 ohm and a 20 ohm resistor connected in parallel? 12
Two identical resistors in parallel have an equivalent resistance of 7 ohms. If the same resistors were instead connected in series, what would be the equivalent resistance? 28
Created by: Ski on 2009-04-25



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