AC & DC currents

• Which type of current periodically reverses its direction?

  Alternating current
• When charge always flows around the same direction, we call it..

  Direct current
• Alternating current is caused by an alternating potential difference..

  True
• Direct current is supplied by..

  ~ Batteries

  ~ Cells
• All countries use alternating current as their mains supply..

  In the UK, the mains supply has a frequency of 50 Hz , and a voltage of 230 V
• The role of an oscilloscope is to..

  Display how voltage changes with time.