The current flows from negative ( - ) to positive ( + ) as the electrons are negatively charged and so are attracted towards the positive terminal of the battery.
direction of current
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Direct & alternating current презентация
Содержание
Alternating Current A.C. stands for alternating current. The mains supplies a.c. An a.c. current flows backwards and forwards in a circuit. The symbol for an a.c. power supply is
Слайд 1 Direct Current
D.C. stands for direct current.
Batteries supply d.c.
With d.c. the
current is always in travelling in the same direction.
The current flows from negative ( - ) to positive ( + ) as the electrons are negatively charged and so are attracted towards the positive terminal of the battery.
The current flows from negative ( - ) to positive ( + ) as the electrons are negatively charged and so are attracted towards the positive terminal of the battery.
Слайд 2 Alternating Current
A.C. stands for alternating current.
The mains supplies a.c.
An
a.c. current flows backwards and forwards in a circuit.
The symbol for an a.c. power supply is
The current in an a.c. circuit flows one way then the other alternately.
The symbol for an a.c. power supply is
The current in an a.c. circuit flows one way then the other alternately.
Слайд 6 AC and DC on an Oscilloscope
A d.c. current on an
oscilloscope
A direct current
1. is always the same size
2. travels in only one direction
A direct current
1. is always the same size
2. travels in only one direction
Слайд 7An alternating current on an oscilloscope
An alternating current:
1. is always changing
size
2. travels one way then the other alternately
2. travels one way then the other alternately
Слайд 8The Mains Supply
The mains supply is an a.c. source.
An alternating current
is a wave.
The mains frequency is 50 Hz and the size of the mains voltage is quoted as 230 V.
The declared value is a sort of average value and is always less than the peak value.
The mains frequency is 50 Hz and the size of the mains voltage is quoted as 230 V.
The declared value is a sort of average value and is always less than the peak value.
