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10.4 Mains electricity

Card 1 of 23

A direct current flows in [     ], whereas an alternating current reverses direction repeatedly.

A

The UK mains supply is about 230 V\boxed{230\ \text{V}}230 V​ at a frequency of 50 Hz50\ \text{Hz}50 Hz.

B
  • The short circuit has very low resistance.
  • This produces an extremely large current.
  • Large I2RI^2RI2R heating can melt insulation and start a fire.
C

Water lowers skin resistance, so I=VRI=\frac{V}{R}I=RV​ gives a larger current.

D

A direct current flows in one direction only, whereas an alternating current reverses direction repeatedly.

Card 1 of 23

10.4 Mains electricity Flashcards

  1. GCSE
  2. /Physics
  3. /10.4 Mains electricity

23 flashcards on Edexcel GCSE Physics 10.4 Mains electricity: the key terms, definitions and equations you need to recall for Paper 1 and Paper 2.

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