1. Electromagnets

2. A push button in the open position.
Series Circuit
A push button in the open position. NO
volt
meter +
Two light bulbs in series with an push button and a current meter.
current
meter

3. A push button in the closed position.
Series Circuit
A push button in the closed position. NO
volt
meter +
current
meter

4. A push button in the open position.
Series Circuit
A push button in the open position. NO
volt
meter +
current
meter

5. A push button in the open position.
Series Circuit
A push button in the open position.
light bulb with an incandescent filament NO
volt
meter +
current
meter
Inductor with a ferromagnetic core

6. A push button in the closed position.
Series Circuit
A push button in the closed position. NO
volt
meter +
Magnetic field lines indicate presence of a magnetic field
current
meter
When current flows a magnetic field is generated around the flowing electrons.
Note:
(a) This magnetic field is also called an electromagnetic field.
(b) This magnetic field is the same magnetic field as the field made by a
horse shoe magnet

7. Flexible thin metal (magnetic) sheet.
Normally Open Relay Circuit
Flexible thin metal (magnetic) sheet. NO
volt
meter
Wooden Sounding box +
current
meter
Wooden block
(noise will be made when block hits sounding board)

8. A push button in the closed position.
Series Circuit
A push button in the closed position. NO
volt
meter +
current
meter
When current flows a magnetic field is generated around the flowing electrons.

9. Normally Open Relay Circuit
volt
meter +
current
meter

10. Normally Open Relay Circuit
volt
meter + +
current
meter

11. A push button in the closed position.
Series Circuit
A push button in the closed position. NO
volt
meter + +
current
meter
When more current flows a stronger magnetic field is generated around the flowing electrons.

12. Normally Open Relay Circuit
volt
meter + +
current
meter

13. Vocabulary Math Inductor Voltage - measured in volts
Current- measured in Amperes
Power- measured in volt-Amperes
Note 1 Watt equals 1 volt-Ampere
Math
The voltage value times the current value equal the power
Power of electric current is directly proportional to the magnetic field strength.
B is the symbol for field strength
B can have units of Newton per cm

14. End of Presentation