Direct and Alternating Current

• What is a direct current (DC)?

  A constant current flowing in one direction
• What does a battery supply in terms of current?

  It supplies a constant current
• What is referred to as alternating current (AC)?

  Current produced by other power sources
• How does alternating current (AC) differ from direct current (DC)?

  AC reverses direction, while DC does not
• What is the frequency of changes in direction for current?

  It is known as frequency
• What is mains electricity?

  An AC supply for general use
• What is the frequency of domestic electricity supply in the United Kingdom?

  50 Hz
• What is the approximate voltage of the domestic electricity supply in the UK?

  About 230 V