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What we will do today:

What we will do today:. Investigate the two ways in which current moves around a circuit (a.c. and d.c.) State whether the mains supply is a.c. or d.c. State whether a battery supply is a.c. or d.c. Use an oscilloscope to see the patterns of a.c. and d.c.

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What we will do today:

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  1. What we will do today: • Investigate the two ways in which current moves around a circuit (a.c. and d.c.) • State whether the mains supply is a.c. or d.c. • State whether a battery supply is a.c. or d.c. • Use an oscilloscope to see the patterns of a.c. and d.c. • Look at energy changes in electronic components.

  2. Electric current • Electric current is sent round a circuit in two different ways: • Direct Current (d.c.): when electrons flow around a circuit in one direction. • A battery supply is an example of d.c. • Alternating Current (a.c.): when electrons move both forwards and backwards in a circuit, changing direction many times in each second. • The mains supply is an example of a.c.

  3. The oscilloscope • An oscilloscope is used to draw a graph of an electric signal. • It shows the following patterns for d.c. and a.c.: d.c. a.c.

  4. Revision of Energy Types • MACHELPS • M ovement (kinetic) • A tomic • C hemical • H eat • E lectrical • L ight • P otential • S ound

  5. Energy transformations: • Whenever there is an electrical current in a component, there is an energy transfer.

  6. 2005

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