Static and current electricity

A negatively charged rod is brought near a metal can that rest on a wooden table you touch the opposite side of the can momentarily with your finger the can then becomes

Positively charged

The purpose of a voltage source is to provide an electric

Pressure

A main difference between gravitational an electric forces is that electric forces

Repel or attract

A difference between electric and gravitational forces is the electric forces include

Repulsive interactions

Electric charge distributes itself on conducting Surfaces

Such that the electric field inside is zero

If electrons were positive and protons were negative Coulombs law would be written

The same

In a circuit powered by a battery it is correct to say that electrons flow

Through both the battery and the devices making up the circuit

Just as a sustained flow of water and a hydraulic circuit needs a pump, the flow of charge and electric circuit needs

Voltage

Electric potential is measured in units of

Volts

In a common dc circuit, electrons typically move at the speed of

a fraction of a centimeter per second

Electric charge will flow in an electric circuit when

a potential difference exists

The unit of electric charge the Coulomb is the charge on

a specific large number of electrons

A negatively charged balloon touching a wooden wall

all of the above

Current that is typically 60 hertz is

alternating current

The electric charge of all electrons

are identical

The pair of protons in the nucleus of a helium Atom

attract a pair of orbiting electrons

An electron and a proton

attract each other

Direct current is normally produced by a

battery

The electric field in the wires of an AC circuit

changes direction with time.

Food cooked in a microwave oven depends on electrical

charge polarization

A suitable electric pump in an electric circuit is a

chemical battery and generator

An ampere is a unit of electric

current

A balloon will stick to a wooden wall if the balloon is charged

either positively or negatively

Which force binds atoms together to form molecules

electric

Every proton in the universe is surrounded by its own

electric field and gravitational field

The fundamental force underlying all chemical reactions is

electrical

A positive ion has a deficiency of

electrons

The electric current in a copper wire is normally composed of

electrons

In an electrically neutral atom the number of protons in the nucleus is equal to the number of

electrons that surround the nucleus

Alternating current is normally produced by a

generator

To say a circuit is the DC is to say that current in the circuit

has a single direction

Just as water flows from high to low pressure, electric charge flows from

high to low voltage

A positive and a negative charge near each other are released as they move the force on each particle

increases

Heat A copper wire and it's electrical resistance

increases

Current in a conductor can be increased by

increasing the voltage across it and reducing its resistance

Ohms law tells us that the amount of current produced in a circuit is

inversely proportional to resistance and directly proportional to voltage

When the voltage across a steady resistance is doubled, the current

is doubled

To say that an object is electrically polarized is to say

its charges have been rearranged

Charge carriers in a metal are electrons rather than protons because electrons are

loosely bound

The electric force between charges depends on the

magnitude of electric charges and separation distance between electric charges

Much of the charge on a conducting cube is

mutually repelled toward its corners.

A rubber rod rubbed with fur becomes

negatively charged

Which of these does not have an electrical charge

neutron

Electric field lines about a point charge extend

outward when the charge is positive.

If you strip electrons from an atom, the atom becomes a

positive ion

The nucleus of an Atom is charged

positively

When you remove electrons from a metal cup the cup becomes

positively charged

The direction of an electric field is defined as the direction of force on

positively charged particle

A sustained flow of electric charge requires

potential difference

The flow of charge in a circuit depends on

potential difference

Electrons flow in a wire when there is

potential difference across the ends of the wire

Voltage is most similar to

pressure

Which of these has the greatest mass

proton

When the distance between two charges is halved the electric force between the charges

quadruples

Two positively charged plastic straws near each other tend to

repel each other

The source of electrons in an ordinary electric circuit is

the electric conductor itself

Two charged particles near each other are released as they move the force on each particle increases therefore the particles have

the opposite sign

The vast numbers of electrons in a coin don't fly off the surface because

they are attracted by an equal number of protons

The electric field between oppositely charged parallel plates is

uniform

Compared to the mass of a proton the mass of an electron is

very much less

A term for electric pressure is

voltage

When we think of electric potential difference we are thinking about

voltage

An electron is pushed into an electric field where requires a one bowl electrical potential if two electrons are pushed the same distance into the same electric field the electric potential of the two electrons is

1 V

It takes 10 J of work to push a charge initially at rest into an electric field. if the charges then released it flies back to its initial position with a kinetic energy of

10 J

It takes 10 J of work to push it charge into an electric field. relative to his starting position it has gained a potential energy of

10 J

If you do 10 J of work to push 1 Coulomb of charge into an electric field, it's a voltage with respect to its starting point is

10 V

The current through a 10 ohm resistor connected to 120 V power supply is

12 A

The amount of energy given to each coulomb of charge flowing through a 12 V battery is

12 J

Which is more dangerous touching a faulty 120 V light fixture, or a van de graaf generator charge to 100,000 V?

120 V light fixture

Two charged particles 1 m apart exert a 1 N force on each other if the particles are instead 0.25 m apart the force on each particle will be

16 N

When a battery does 24 J of work on 10 C of charge the voltage it supplies is

2.4 V

A length of wire has resistance R. The same kind of wire twice as long has resistance

2r

Two charge particles 1 m apart exert a 1 N in force on each other if the particles are instead 0.5 m apart the force on each particle will be

4 N

Two charged particles 1 m apart exert a 1 N force on each other. if the magnitude of each charges doubled, the force on each particle will be

4 N

The value of a resistor that carries 2 A when connected to 10 V is

5 ohms

A Coulomb of charge flowing in a bulb filament powered by a 6 V battery is provided with

6 J

A Coulomb of charge passing through a 6 V battery acquires

6 J

An electrically polarized object normally has

A net charge of zero and displaced charges

Which of these both of the same length as the greater electrical resistance

A thin copper wire

The different outcomes and touching a faulty 120 V light fixture and a high-voltage Van de Graaff generator have to do with differences in

All of the above

The electric field lines between a pair of equal and opposite charges are

All of the above

When you purchase a water pipe in a hardware store, water is not included. when you purchased copper wire electrons

Already exist in the wire

Which of these scientists pioneered the study of electricity

Benjamin Franklin

To say that electric charge is conserved it to say that electric charge

Can neither be created nor destroyed

Electric potential is the ratio of electric energy to the amount of electric

Charge

Normally a balloon charge to several thousand volts has a relatively small amount of

Charge and energy

The electric force between charge is the strongest when the charges are

Close together

More current will occur in a lamp when it's filament is

Cold

A proton and electron placed in a electric field experience the same force. which undergoes the greater acceleration

Electron

Two charged particles repel you chowder with a force F if the charge of one particle is doubled and the distance between them is doubled the force will be

F/2

a sustained electric current can be achieved with

Generator and battery

The unit of resistance is named after

Georg Simon Ohm

The flow of electrons in an electric circuit move by

Interacting with an established electric field

When a steady voltage is across 1/2 as much resistance, the current

Is doubled

The voltage across a 10 ohm resistor carrying a current of 5 A is

More than 20 V

As you comb your hair electrons are rubbed on to the comb which becomes

Negatively charged

When you scuff electrons from the carpet onto your shoes you become

Negatively charged

To say that electric charges Conserved means that no cases ever been found where

Net charge has been created or destroyed

The electric field around an isolated electron has a certain strength at a 1 cm distance from the electron. the electric field strength 2 centimeters away from the electron is

None of the above

Two charge particles near each other are released. as the particles move, the velocity of each increases therefore the particles have

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