Subject:
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Re: 9 Volt output
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 7 Sep 2004 12:10:21 GMT
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Viewed:
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3103 times
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In lugnet.technic, Patrick Levy wrote:
> Can anyone explain in detail the difference
The difference is the amount of current provided - all can provide 9V, but
each has a different current limit. The amount of power delivered to an
electrical device depends on both the voltage and the current (in equations,
P=I*V). The battery boxes have no real "current limiter" (and so, in theory,
should provide the highest amount of delivered power... but see below), while
the RC unit (I think) has a current limiter (that doesn't limit it much), and
the RCX limits the current to 500 mA for each output.
The two battery boxes have different performances due to internal resistance
- if you try to draw a high current from a battery, it acts as if it has an
internal resistor, which drops the supplied voltage. So under high-current
applications, batteries will always provide less than the rated voltage. No, I
don't know which battery box has the lower internal resistance (probably the 6
AA).
A final caution is that all four of these have overtemperature protection
devices in them - if you try to draw too high a current for too long, then due
to that pesky internal resistance the system would heat up. To prevent this,
there's a component that when it heats up cuts off the current, thus preventing
the batteries or other components of the system from reaching dangeroud
temperatures.
--
Brian Davis
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Message is in Reply To:
 | | 9 Volt output
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| Hi people, Can anyone explain in detail the difference (Or point where I can read about it) of using this power sources: 9 Volts AA LEGO battery box (6 batteries) RCX motor output (6 batteries) 8475 (RC Buggy) RC Unit (6 batteries) 9 Volt battery (...) (20 years ago, 7-Sep-04, to lugnet.technic)
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