Using Electricity: AC and DC

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?

amperes
What is electric charge measured in?

coulombs (C)
What is voltage?

a measure of the energy given to the charges in the circuit
What is voltage measured in?

volts
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?

50Hz
In the UK what is the mains voltage?

230v
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?

reduces current

Author

crobertsonx

86357

Card Set

Using Electricity: AC and DC

Description

Using Electricity: Section 2- AC and DC

Updated

2011-05-17T17:34:49Z

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