Generation of an EMF

Principles of Electrical Science

Generation of an EMF

• Equation: e = Blv

  • e = induced Electromotive Force (EMF)

  • B = flux density (measured in teslas)

  • l = length of the conductor (in meters)

  • v = velocity of the conductor (in meters/second)

Example Calculations

Example 1

• Scenario:

  • Conductor length: 15 cm (0.15 m)

  • Velocity: 20 m/s

  • Flux density: 2 teslas

• Calculation:

  • e = Blv = 2 × 0.15 × 20 = 6 volts

Example 2

• Scenario:

  • Conductor length: 0.5 m

  • Velocity: 30 m/s

  • Flux density: 3 teslas

• Calculation:

  • e = Blv = 3 × 0.5 × 30 = 45 volts

Direction of Induced Current

Fleming's Right Hand Rule

• Thumb: Direction of the motion of the conductor

• First Finger: Direction of the magnetic field (from North to South)

• Second Finger: Direction of the induced current

Application of Right Hand Rule

• Movement: Conductor moving upwards through the magnetic field

• Current Direction: Flows towards the observer

Conclusion

• Understanding the generation of EMF is crucial in electrical science, particularly in the context of electromagnetic induction.