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Power consumption of wall-wart power supply?

S

Steve

Jan 1, 1970
0
I'm using a circuit that takes 300mA from a wall-wart 9VDC linear
unregulated power supply.

What would be an estimate of the watts it uses from the power lines (in the
UK, so ~240VAC)?

Many thanks.

Steve
 
D

dB

Jan 1, 1970
0
Steve said:
I'm using a circuit that takes 300mA from a wall-wart 9VDC linear
unregulated power supply.

What would be an estimate of the watts it uses

Three.
 
M

Michael A. Covington

Jan 1, 1970
0
Steve said:
I'm using a circuit that takes 300mA from a wall-wart 9VDC linear
unregulated power supply.

What would be an estimate of the watts it uses from the power lines (in
the
UK, so ~240VAC)?

300 mA x 9 V = 2.7 watts coming out of the wall wart.

Allowing for some inefficiency, maybe as much as 5 watts in.
 
J

john jardine

Jan 1, 1970
0
Steve said:
I'm using a circuit that takes 300mA from a wall-wart 9VDC linear
unregulated power supply.

What would be an estimate of the watts it uses from the power lines (in the
UK, so ~240VAC)?

Many thanks.

Steve
Fully loaded about 6watts. Just sitting there, about 3watts
regards
john
 
S

Steve

Jan 1, 1970
0
Steve said:
I'm using a circuit that takes 300mA from a wall-wart 9VDC linear
unregulated power supply.

What would be an estimate of the watts it uses from the power lines (in the
UK, so ~240VAC)?

Many thanks.

Steve

Many thanks for the replies to this thread - very simple now I realise! I
only need a rough figure so that's great.

Steve
 
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