THE CONTROL OF ELECTRICITY IN CIRCUITS

• 1a) What’s the difference between current electricity and static electricity? • Current electricity is the flow of electrons in a circuit through a conductor

• Static electricity is the electric charge that builds up on the surface of an object. Static electricity discharges when it is given a path, but it does not continue to flow

Electricity vs. Static Electricity

AC vs DC• 1b) What do AC and DC stand for and what’s the

difference between them?• Alternating current (AC) flows back and forth at regular intervals

called cycles. • Direct current (DC) only flows in one direction

Current Electricity

• 2. a) Define Current electricity ?• Current electricity is the continuous flow of electrons in

a circuit• 2 conditions must be met for electrons to flow

continuously:• (1) The flow of electrons requires an energy source• (2) The electrons will not flow unless they have a complete

path to follow

• What is an electrical circuit• An electric circuit includes an energy source, a conductor and a

load

Electric Circuits

See figure 11.4 on p.434

Electric Circuits• 4a) electrical load

• converts the electrical energy to another form of energy

• 4b) switch• A device that turns the circuit on/off by closing or opening the

circuit

• When the switch is closed• the circuit is complete and electrons (-) can flow

• An open switch means there is a • break in the path so the electrons cannot flow through the circuit

• The circuit is turned OFF when the switch is open.

Circuit Diagrams• 5a) What is a circuit diagram?

• Diagram with special symbols thatshow the components andconnections in a circuit

• 5b) Why are they useful?• Makes it easier to plan and analyze a circuit before you build it.

• 5c) List the 2 rules to follow when drawing circuit diagrams:• Always use a ruler to draw straight lines for the conducting wires• Makes right angle corners so that your finished diagram is a

rectangle

Series and Parallel Circuits• 7a) What is a series circuit?

• A series circuit has components that are arranged one after another in series.

• 7b) How many paths does a series circuit have to allow the flow of electrons? • one

• 8a) What is a parallel circuit?• A parallel circuit has parts that are arranged so that the electrons

can flow along more than one path

Electrical Safety• List, define and explain how 3 common safety devices

work.

Electrical Safety• List, define and explain how 3 common safety devices

work.

Electrical Safety• List, define and explain how 3 common safety devices

work.

Electrical Safety• List, define and explain how 3 common safety devices

work.