Current Electricity

1
Current Electricity

• TLW contrast a series circuit and a parallel
  circuit.

2
Electricity needs a complete path along which to
follow.
3
How Does Electricity Flow?

• Electricity must follow a complete path
• Circuits can be closed, or complete, or
  they can be open, or incomplete
• The path that electricity can move through is
  called a circuit
• The electricity that flows through a circuit is
  called current electricity

4
Series Circuit

• Two objects are connected in a single path
• Electricity can flow in only one way
• Refer to pages F82 and F83
• Closed Circuit when both bulbs are in place
• Needed in order for electricity to flow
• Open Circuit created when one bulb is removed
• Current cannot complete its path
• The bulbs are dim when lit

5
Series Circuit
Closed Circuit
Open Circuit
D-cell
D-cell

-

-
Electricity can flow
Electricity cannot flow
6
Parallel Circuit

• It connects each object to the cell separately
• Provides two paths by which current can flow
• When one bulb is removed from a parallel circuit,
  the other bulb is still a part of a complete
  circuit
• That is why it remains lit
• The bulbs are brighter than in a series circuit
• What advantage can a parallel circuit have?

7
Parallel Circuit
D-cell
D-cell

-

-
8
Comparison
Series Parallel
Connection Both bulbs are on the same circuit Each bulb is on a separate circuit
Removing one bulb Both bulbs go off Only the removed bulb goes off
Brightness Dim Bright
9
Review

• Complete workbook page 318
• What is a circuit?
• What are two ways that a circuit can be arranged?
• How is a parallel circuit different from a series
  circuit?
• How are the circuits similar?