yourwins Posted November 23, 2004 Report Share Posted November 23, 2004 hello..........anyone who have an idea to decrease the car battery's Ampere ?thank you...................... :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) Quote Link to comment Share on other sites More sharing options...
ante Posted November 23, 2004 Report Share Posted November 23, 2004 You have to explain what you mean, it Quote Link to comment Share on other sites More sharing options...
yourwins Posted November 24, 2004 Author Report Share Posted November 24, 2004 example:normally car battery is 12V 75Athe problem is how to reduce the Ampere to 30A or smaller value, but the value of Volt is not change, still 12V.thank.............. Quote Link to comment Share on other sites More sharing options...
ante Posted November 24, 2004 Report Share Posted November 24, 2004 You can Quote Link to comment Share on other sites More sharing options...
surajbarkale Posted November 26, 2004 Report Share Posted November 26, 2004 The battery is not a constant current source but it is a constant voltage source. The 12V/75A specifications mean that it will hold the terminal voltage to 12V for current form 0A to 75A. In practice you will not get exactly 12V over the range but voltage will be closer to 12V. So don't worry about the current if you require only 30A. Quote Link to comment Share on other sites More sharing options...
ante Posted November 26, 2004 Report Share Posted November 26, 2004 Hi Suraj,The battery is not a constant voltage source! The voltage changes with load and state of charge. And the 75A(h) is not the current it Quote Link to comment Share on other sites More sharing options...
MP Posted November 27, 2004 Report Share Posted November 27, 2004 yourwins,What are you trying to accomplish? Are you needing a current limiter so as to not exceed 30 amps to something connected to this battery? Please state what you want to accomplish and I am sure others will be able to help with the circuit.MP Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted November 27, 2004 Report Share Posted November 27, 2004 A car battery is switched at the rotor. The rotor turns delivering the path to ground, through the spark plug, for your switched voltage. When you apply 12 volts to the autotransformer the voltage is stepped up. When the rotor loses contact the transformer is grounded out. When the stator lines up you get the 12 volts through the autotransformer and on to the spark plug. Quote Link to comment Share on other sites More sharing options...
ante Posted November 27, 2004 Report Share Posted November 27, 2004 This makes no sense to me Kevin: Quote Link to comment Share on other sites More sharing options...
Dazza Posted November 28, 2004 Report Share Posted November 28, 2004 Hi,I agree with MP.We need to know what you are trying to accomplish ???. Quote Link to comment Share on other sites More sharing options...
yourwins Posted December 12, 2004 Author Report Share Posted December 12, 2004 Something like this............... Quote Link to comment Share on other sites More sharing options...
audioguru Posted December 12, 2004 Report Share Posted December 12, 2004 Hi Yourwins,Are you trying to protect your wiring from melting or causing a fire by limiting the current to 30A?Why not do the same as car manufacturers, use a 30A fuse or breaker and a label that says, "Do not exceed 30A". Quote Link to comment Share on other sites More sharing options...
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