Direct and alternating potential difference Direct and alternating potential difference


    • Mains electricity is an ac supply. In the United Kingdom the domestic electricity supply has a frequency of 50 Hz and is about 230 V.

Students should be able to explain the difference between direct and alternating potential difference.

KS4 -P5.1 - Alternating current

Compare a.c D.c

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The AC DC War


AC slow mo


Demo :

  • Oscilloscope
  • Power supply AC/DC
  • AC/DC demo showing tarnsformers
  • Length of wire across front desk glowing to show energy loss.

Oscilloscope to show AC - plug into power supply to show difference in the AC current and the DC current going though the power lines



  • Use of High voltage
  • Use of hot wire

Reading Oscilloscope F

Reading Oscilloscope F ANS

Reading Oscilloscope H

Reading Oscilloscope H ANS