Lesson test: Voltage, the pressure that drives charge

1.[2p]
Electric potential is defined as

the potential energy per unit charge at a point

Correct

the total charge at a point

The answer is: the potential energy per unit charge at a point

the force on a charge

The answer is: the potential energy per unit charge at a point

the current through a point

The answer is: the potential energy per unit charge at a point

2.[1p]
One volt is

one joule of energy per coulomb of charge

Correct

one coulomb per second

The answer is: one joule of energy per coulomb of charge

one newton per coulomb

The answer is: one joule of energy per coulomb of charge

one joule per second

The answer is: one joule of energy per coulomb of charge

3.[2p]
Only differences in potential drive a current because

potential, like height, has no absolute zero that matters; a difference is what makes charge flow

Correct

absolute potential is always zero

The answer is: potential, like height, has no absolute zero that matters; a difference is what makes charge flow

charge cannot measure absolute voltage

The answer is: potential, like height, has no absolute zero that matters; a difference is what makes charge flow

a single terminal has no charge

The answer is: potential, like height, has no absolute zero that matters; a difference is what makes charge flow

4.[2p]
A battery raises 3 coulombs through a potential difference of 12 V. How many joules of energy does it give them?

CorrectNot quite: 36

5.[2p]
In the gravitational picture of a circuit, a resistor corresponds to

a downhill slope where charge gives up energy as it falls

Correct

the pump that lifts the water

The answer is: a downhill slope where charge gives up energy as it falls

level ground the charge coasts along

The answer is: a downhill slope where charge gives up energy as it falls

the reservoir at the top

The answer is: a downhill slope where charge gives up energy as it falls

6.[2p]
The electromotive force of a source is

the energy per coulomb it adds by lifting charge from low to high potential

Correct

a mechanical force in newtons

The answer is: the energy per coulomb it adds by lifting charge from low to high potential

the current it delivers

The answer is: the energy per coulomb it adds by lifting charge from low to high potential

its internal resistance

The answer is: the energy per coulomb it adds by lifting charge from low to high potential

7.[2p]
Choosing which point in a circuit is called ground, or zero volts, changes the currents that flow.

True

The answer is: False

False

Correct

1.[2p] Electric potential is defined as

2.[1p] One volt is

3.[2p] Only differences in potential drive a current because

4.[2p] A battery raises 3 coulombs through a potential difference of 12 V. How many joules of energy does it give them?

5.[2p] In the gravitational picture of a circuit, a resistor corresponds to

6.[2p] The electromotive force of a source is

7.[2p] Choosing which point in a circuit is called ground, or zero volts, changes the currents that flow.

1.[2p]
Electric potential is defined as

2.[1p]
One volt is

3.[2p]
Only differences in potential drive a current because

4.[2p]
A battery raises 3 coulombs through a potential difference of 12 V. How many joules of energy does it give them?

5.[2p]
In the gravitational picture of a circuit, a resistor corresponds to

6.[2p]
The electromotive force of a source is

7.[2p]
Choosing which point in a circuit is called ground, or zero volts, changes the currents that flow.