Using Electricity: AC and DC

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Author:
crobertsonx
ID:
86357
Filename:
Using Electricity: AC and DC
Updated:
2011-05-17 13:34:49
Tags:
Using electricity alternating direct current AC DC physics
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Description:
Using Electricity: Section 2- AC and DC
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  1. What is current?
    the movement of electric charge around a circuit
  2. Why can current pass thought a conductor?
    there are electrons that are free to move
  3. Why can current not pass through an insulator?
    there are no charges that are free to move
  4. What is current measured in?
    amperes
  5. What is electric charge measured in?
    coulombs (C)
  6. What is voltage?
    a measure of the energy given to the charges in the circuit
  7. What is voltage measured in?
    volts
  8. What is A.C.?
    • Alternating current is when the current changes direction every fraction of a second.
    • The mains supplies a.c.
  9. In the UK what is the mains frequency?
    50Hz
  10. In the UK what is the mains voltage?
    230v
  11. What is D.C.?
    • Direct current is when the current passes in one direction only
    • Batteries supply D.C.
  12. How can the difference between A.C. and D.C. be seen?
    by connecting the supplies to an oscilloscope
  13. What does a resistor do?
    reduces current

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