Aiming for Grade 6 LOs:

• Describe the operation of an alternator, moving-coil microphone and loudspeaker in simple terms.
• Describe the operation of a d.c. generator.
• Identify the period and peak output voltage for generators from an oscilloscope trace.

Aiming for Grade 8 LOs:

• Describe the output of an alternator, linking this to the position of the coil to the magnetic field and the speed of rotation.
• Explain the operation of a d.c. generator and its output.
• Explain why the peak voltage of an a.c. generator is produced when the plane of the coil is parallel to the magnetic field lines.