electric potential energy. electric charge measured in coulombs six million trillion electrons is...

Electric Potential EnergyElectric Potential Energy

Electric ChargeElectric Charge Measured in COULOMBSMeasured in COULOMBS

Six million trillion electrons is about - 1 C. Six million trillion electrons is about - 1 C. Six million trillion protons is about + 1 C.Six million trillion protons is about + 1 C.

Electric Potential EnergyElectric Potential Energy

Electric Potential EnergyElectric Potential Energy This spring has This spring has

more SPE when more SPE when it is compressedit is compressed

Electric Potential EnergyElectric Potential Energy This spring has This spring has

more PE when it is more PE when it is compressedcompressed

Likewise, these Likewise, these charges will have charges will have more potential more potential energy when they energy when they are pushed closerare pushed closer

Electric Potential EnergyElectric Potential Energy PE equals the amount of work done to PE equals the amount of work done to

move a charge from one place to move a charge from one place to another. another.

Electric Potential EnergyElectric Potential Energy

Which will have the larger electric Which will have the larger electric potential energy?potential energy?

Electric Potential EnergyElectric Potential Energy

A – because it requires work to move it A – because it requires work to move it away from the negative charge.away from the negative charge.

Electric Potential (volts)Electric Potential (volts) EP = work/chargeEP = work/charge

Electric Potential (volts)Electric Potential (volts) ExampleExample:  1000 joules of work is done to:  1000 joules of work is done to

move the charge q from far away to the move the charge q from far away to the place indicated. place indicated.

If q = 10 C, what is the electric potentialIf q = 10 C, what is the electric potentialat the new location?at the new location?

Electric Potential (volts)Electric Potential (volts) ExampleExample:  1000 joules of work is done to:  1000 joules of work is done to

move the charge q from far away to the placemove the charge q from far away to the placeindicated. indicated.

If q = 10 C, what is the electric potentialIf q = 10 C, what is the electric potentialat the new location?at the new location?

Voltage = work/chargeVoltage = work/charge V = 1000 J/10C = 100 VoltsV = 1000 J/10C = 100 Volts

Electric Potential (volts)Electric Potential (volts) What if the charge in the previous What if the charge in the previous

problem were now 100 C instead of 10? problem were now 100 C instead of 10? What would happen to the EP?What would happen to the EP?

Electric Potential (volts)Electric Potential (volts) What if the charge in the previous What if the charge in the previous

problem were now 100 C instead of 10? problem were now 100 C instead of 10? What would happen to the EP?What would happen to the EP?

IT WOULD BE THE SAME!!!IT WOULD BE THE SAME!!! Work would also increaseWork would also increase

Electric Potential (volts)Electric Potential (volts) Electric potential Electric potential

is associated with is associated with LOCATION, not LOCATION, not CHARGECHARGE

Electric Potential vs Electric Potential vs Potential EnergyPotential Energy

Which charge has Which charge has more electric more electric potential?potential?

Which has more Which has more potential energy?potential energy?

Is 5000 Volts Dangerous?Is 5000 Volts Dangerous?

Is 5000 Volts Dangerous?Is 5000 Volts Dangerous? NOPE!NOPE! When 1 million When 1 million

electrons are electrons are added to a added to a neutral balloon, neutral balloon, it has an electric it has an electric potential of potential of 5000 volts5000 volts

Potential Difference Potential Difference (voltage)(voltage)

Difference in electric potential between Difference in electric potential between two points.two points.

Potential Difference Potential Difference (voltage)(voltage)

Difference in electric potential between Difference in electric potential between two points.two points.

Potential difference between A and B is 0Potential difference between A and B is 0A B

Potential Difference Potential Difference (voltage)(voltage)

Difference in electric potential between Difference in electric potential between two points.two points.

Now there is a potential differenceNow there is a potential differenceA

B

Potential DifferencePotential Difference Batteries provide Batteries provide

potential difference potential difference between one end of the between one end of the circuit and the othercircuit and the other

Potential DifferencePotential Difference Batteries provide Batteries provide

potential difference potential difference between one end of the between one end of the circuit and the othercircuit and the other

Charges flow from high Charges flow from high to low electric potentialto low electric potential

Potential Difference Potential Difference (voltage)(voltage)

Potential difference = difference in PE (J)Potential difference = difference in PE (J)(V)(V) ______________________________________

charge (C)charge (C)