Using Electricity: AC and DC
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What is current?
the movement of electric charge around a circuit
Why can current pass thought a conductor?
there are electrons that are free to move
Why can current not pass through an insulator?
there are no charges that are free to move
What is current measured in?
What is electric charge measured in?
What is voltage?
a measure of the energy given to the charges in the circuit
What is voltage measured in?
What is A.C.?
- Alternating current is when the current changes direction every fraction of a second.
- The mains supplies a.c.
In the UK what is the mains frequency?
In the UK what is the mains voltage?
What is D.C.?
- Direct current is when the current passes in one direction only
- Batteries supply D.C.
How can the difference between A.C. and D.C. be seen?
by connecting the supplies to an oscilloscope
What does a resistor do?
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