# Mains Electricity

The UK mains supply is approximately...
230V and is an A.C. - Alternating Current
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An a.c. is constantly changing direction...
and the mains has a frequency of 50 Hz
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The voltage of a battery is about...
1.5V and is a D.C. - Direct Current
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A d.c. flows in only...
one direction
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Frequency is how many...
complete waves per second (Hz) F= 1/T
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Time Period is how many...
seconds fro 1 complete wave (s) T= 1/F
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Trace...
is a graph of voltage by time
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Voltage Sensitivity...
How many volts per division (cm or square) going vertically on the oscilloscope
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Time Base...
How much time passes in each division (" ") horizontally on the oscilloscope
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If the trace on the screen is a straight line ,it is a...
d.c. supply as it is always at the same voltage
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An a.c. gives a regular repeating wave, which you can...
work out the period and frequency of the supply
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Gain dial controls how many...
volts each division represnts on th vertical axis
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Time Base dial controls how many...
milliseconds (1ms = 0.001s) each division represents on the horizontal axis
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## Other cards in this set

### Card 2

#### Front

and the mains has a frequency of 50 Hz

#### Back

An a.c. is constantly changing direction...

### Card 3

#### Front

1.5V and is a D.C. - Direct Current

one direction

### Card 5

#### Front

complete waves per second (Hz) F= 1/T