8.2 Electric CurrentName:

Date:

Block:

(Reference: BC Science 9 pp. 280 - 289)

Electric Circuits

  • electric circuit: ______

______

ENERGY AROUND A CIRCUIT

  • electric load: ______

______

  1. Ex. a light bulb or a buzzer
  • The simple circuit on the right includes:
  • ______
  • ______
  • ______
  • In the diagram above, chemical energy from the battery gives electrons on the ______terminal electric potential energy, making them attracted to the ______terminal.
  • Electrons leave the ______terminal, pushed by the ______, and flow along the ______to the load (buzzer).
  • In the ______(buzzer), the electron’s electric potential energy is transformed into another form(s) of energy (Ex. ______).
  • Electrons flow back to the ______terminal of the battery through the wire.

Circuit Components AND DIAGRAMS

There are four basic types of components:

  1. ______: the source of energy

Ex. battery

  1. ______: wire where current flows

Ex. wire

  1. ______: turns electricity into other forms

Ex. bulb, buzzer

  1. ______: turns circuit on or off
  • ON: ______switch
  • OFF: ______switch
  • circuit diagrams: pictures that use ______for different parts of the circuit.

Criteria for drawing Circuit diagrams:

Use a ruler

All wires and leads are straight lines connected with 90˚ angles.

Do not let conductors cross over one another

Diagram should be a rectangle or square.

ELECTRONS ARE SO PUSHY

  • When a battery is connected to a circuit and the switch is closed, ______immediately start pushing.

This causes the______to work right away.

CURRENT ELECTRICITY AND STATIC ELECTRICITY

  • static electricity: charge ______in one place.

Ex. Charge on insulators

  • current electricity: the continuous ______of charge in a complete circuit.

Ex. Charge from a battery connected to a complete circuit

CURRENT: THE MEASURE OF FLOW

  • electric current: ______

______

  • measured in ______(____),
  • small currents in ______(____)
  • named after André-Marie Ampère
  • measured by a device called an ______.

CONVENTIONAL CURRENT

  • Based on ideas from ______.
  • Idea that electricity flowed from ______to ______.
  • Positive meaning a ______amount of electric fluid
  • Negative meaning a ______amount of electric fluid
  • Still used today by electricians, etc.
  • Opposite to what we believe today: Electron Flow:

the flow of electrons is from ______to ______.

SUMMARY: