Potential Difference & Power (AS)

Moving an electron inside an electric field can change which quantity?

• the electron’s mass

• the electron’s charge

• the electron’s potential energy

• the electron’s spin

If an electrical circuit is modelled as a water circuit at a water park, then the battery voltage is comparable to:

• the rate at which water flows through the circuit

• the speed at which water flows through the circuit

• the distance that water flows through the circuit

• the difference in water pressure between the top and bottom of the circuit

If the electrical circuit in your phone is modelled as a water circuit at a water park, then the battery is comparable to:

• the people that slide from the elevated positions to the ground

• the pump that moves water from the ground to the elevated positions

• the pipes through which water flows

• the distance that water flows through the circuit

Which of the following is true about the electrical circuit in your phone?

• Charge moves around the circuit very fast - nearly as fast as the speed of light

• The battery supplies the charge (electrons) that moves through the wires

• The charge becomes used up as it passes through the light bulb.

• The battery supplies energy that raises charge from low to high potential.

If a battery provides a high voltage, it can:

• do a lot of work on each coulomb of charge that passes through it

• do a lot of work over the course of its lifetime

• push a lot of charge through a circuit

• last a long time

The value of the potential at point A compared to point D is:

• 12 V higher

• 12 V lower

• exactly the same

• impossible to tell

The electric potential energy of a positive charge is lowest at point:

• A

• B

• C

• D

Energy is required to force a positive test charge to move:

• through the wire from point A to point B

• through the light bulb from point B to point C

• through the wire from point C to point D

• through the battery from point D to point A

The work done moving +2 C of charge between points D and A is:

• 24 J

• 2.0 J

• 6.0 J

• 12 J