5.1 To state the characteristics of a magnetic field. (COM)

Preview some common magnetic terms.

Have students work with different types of magnets (e.g., temporary, permanent, natural) and experiment with iron filings.

Using correct terminology, have students explain various interactions.

Students will connect a current carrying wire and a compass or iron filings to demonstrate the magnetic field.

5.4 To state the factors that change the strength of an electromagnetic field. (IL)

5.5 To state the left-hand rule for current flow.

Have students experiment to prove the left hand rule.

5.6 To explain the "solenoid" effect of an iron core in an electromagnetic field.

Have students experiment to prove the effect of electricity on an iron core.

For example, have students create a simple electromagnet with a bolt, copper wire and a battery to pick up small nails.

5.7 To understand the operation of a buzzer and a bell.

Students may draw a wiring and schematic diagram for a buzzer and bell circuit.

Wire a buzzer and a bell circuit.

5.8 To understand the operation of a common residential door chime. (IL)

Have students wire a door chime from two locations.

Students may then draw a wiring and schematic diagram for a two station door chime circuit.

5.9 To identify the operating principles of a basic signal system.

Have the students draw a schematic diagram of a basic signal system, then wire the basic signal system using all the applicable electrical code rules. (TL)

5.10 To understand and create a small magnetic relay.

Students wire a magnetic relay into an electrical circuit.

Draw a wiring and schematic diagram of a magnetic relay in an electrical circuit.

Have the students identify and wire a remote control relay following the current code rules.

5.11 To understand and create a stop-start momentary contact switch.

Students may draw a schematic diagram of a stop-start momentary contact switch.

Have students wire a stop-start momentary contact switch controlling some type of electrical device.

5.12 To explain the operation of multi-use magnetic relays.