Current

Current

Multiple Choice

Moving 4.0 coulombs of charge through a circuit requires 48 Joules of electric energy.

What is the charge (q)

• 4 C

• 48 J

Multiple Choice

Moving 4.0 coulombs of charge through a circuit requires 48 Joules of electric energy.

What is the work done on the circuit?

• 4 C

• 48 J

Open Ended

Moving 4.0 coulombs of charge through a circuit requires 48 Joules of electric energy. What is the potential difference across the circuit?

Charge

• Current is a flow of electrical charge carriers.

Formula

• I = q

        t

  
  

  I = current (Ampere, A)

  q = charge (Coulombs, C)

  t = time (seconds, s)

  
  

Example #1

• A total charge of 1000 C passes through a point in a light bulb in 15 seconds.  What is the current of the light bulb?

• q = 1000 C

• t = 15 s

• I = I

Multiple Choice

A light bulb has a current of 6 A. How much charge passes through a point in the light bulb in 30 s?

What is the charge (q)?

• 6 A

• 30 s

• unknown

Multiple Choice

A light bulb has a current of 6 A. How much charge passes through a point in the light bulb in 30 s?

What is the time (t)

• 6 A

• 30 s

• unknown

Multiple Choice

A light bulb has a current of 6 A. How much charge passes through a point in the light bulb in 30 s?

What is the current (I)?

• 6 A

• 30 s

• unknown

Example #2

• A light bulb has a current of 6 A.  How much charge passes through a point in the light bulb in 30 s?

• q = q

• t = 30

• I = 6 A

Multiple Choice

A light bulb has a current of 6 A. How much time does it take 60 C of charge to passes through a certain point?

What is the charge (q)?

• 6 A

• 60 C

• unknown

Multiple Choice

A light bulb has a current of 6 A. How much time does it take 60 C of charge to passes through a certain point?

What is the time (t) ?

• 6 A

• 60 C

• unknown

Multiple Choice

A light bulb has a current of 6 A. How much time does it take 60 C of charge to passes through a certain point?

What is the current?

• 6 A

• 60 C

• unknown

Example #3

• A light bulb has a current of 6 A.  How much time does it take 60 C of charge to passes through a certain point?

• q = 60

• t = t

• I = 6