Potential Difference

Potential Difference

Open Ended

Before a collision, a blue marble and a red marble have a combined momentum of 60 kg m/s. After a 0.02 s impact, the combined momentum of the blue and red marbles is 10 kg m/s. Determine the change in momentum?

Open Ended

If the change in momentum is -50 kg m/s, and the collision lasted 0.02 seconds, what is the force that was imparted on the marbles?

Potential Difference

• Potential Difference: the difference in electrical potential between two points.  Commonly referred to as voltage.

Formula

• V = W

         q

  
  

  V = Potential Difference (Volts, V)

  W = Work (Joules, J)

  q = Charge (columbs, C)

  
  

Units

• V = W

         q

  
  

  Vols (V) = Joules (J)

                   Coulombs (C)

  
  

Open Ended

A potential difference of 1 V exists between two points, A and B, within an electric field. What is the magnitude of charge that requires 20 J of work to move it from A to B.

What is the the value of Each of the following variables?

V

W

q

Remember:

Potential Difference (V) is in Volts (V)

Work is in Joules (J)

Charge is in Coulombs (C)

Example 1

• A potential difference of 1 V exists between two points, A and B, within an electric field.  What is the magnitude of charge that requires 20 J of work to move it from A to B?

Open Ended

If 20 J of work is used to transfer 20 C of charge, the potential difference across the resistor is?

What is the the value of Each of the following variables?

V

W

q

Remember:

Potential Difference (V) is in Volts (V)

Work is in Joules (J)

Charge is in Coulombs (C)

Example 2:

• If 20 J of work is used to transfer 20 C of charge, the potential difference across the resistor is?

Open Ended

The potential difference between the two terminals on a battery is 9 volts. How much work (energy) is required to transfer 150 coulombs of charge across the terminals?

What is the the value of Each of the following variables?

V

W

q

Remember:

Potential Difference (V) is in Volts (V)

Work is in Joules (J)

Charge is in Coulombs (C)

Example 3

• The potential difference between the two terminals on a battery is 9 volts. How much work (energy) is required to transfer 150 coulombs of charge across the terminals?