Batteries Series Parallel
January 6, 2009
A few questions to make sure I don't burn something up. I am playing around with different batteries and ways to make my bots last longer between charges. I want to ensure I have this right before I hook anything up.
First off lets assume I have 5 volts hooked up to a LED (max rated current of 30milliamps) using a 150 ohm resistor (5 volts divided by .03 amps = 166 resistor to keep LED from burning out).
Series: Lets say I take a 5 volt battery pack and hook it up in series making the total voltage 10 volts.
Assumption: The LED will burn out due to the increased voltage. I need to use a 330 ohm resistor to keep ir from burning out (10 volts divided by .03 amps = 333 ohms).
Parallel: Lets say I hook up a 5 volt battery pack in parallel making the total volts still 5 but doubling the amperage (also how long the LED will stay lit until the battery can no longer keep the LED on.
Assumption: No change required the 150 ohm resistor will keep the LED on and it will stay lit approx twice as long as the first scenario with the one 5 volt battery.