Circuit Electricity. Circuit Builder Interactive: Builder/Circuit-Builder-Interactive.

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Presentation transcript:

Circuit Electricity

Circuit Builder Interactive: Builder/Circuit-Builder-Interactive

Batteries  Batteries push electrons through circuits. The pressure with which they push is called voltage (V).

Current  The rate at which positive charges flow through a circuit.  Unit is Amperes (A)

Resistors

 They slow the rate at which charges move through a circuit.  Unit is Ohms (Ω)

Ohm’s Law  An equation for simple circuits…

Parallel circuit:  When electric current divides into two paths, then recombines.

Resistors in Parallel

Series Circuit  A portion of a circuit in which current follows one path.

Resistors in Series

Series or Parallel?

Example 1:  Determine the equivalent resistance in the following circuit.

Example 2:  Determine the equivalent resistance in the following circuit. R 3 = 1.0 Ω R 2 = 2.0 Ω R 1 = 1.0 Ω

Homework: Draw the following circuits, and determine the equivalent resistance for each one R 4 =2Ω R 1 =3Ω R 2 =3Ω R 3 =1Ω

Important Observations  Resistors cause electric pressures (voltages) to drop

Finding Resistance in Specific Resistors Series:  When resistors are connected in series, they all carry the same current. Parallel:  When resistors are connected in parallel, they all cause the same change in voltage.

Power  The amount of power at a point in a circuit is given by…

Example 1:  Determine the current running through an 8Ω speaker that is plugged into an American power outlet.

Example 2:  Determine the resistance of the filament within a 60W lightbulb.