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  1. The internal resistance of the LED, as detailed by @SpehroPefhany
  2. The internal resistance of the battery.

@SpehroPefhany is right about the LED. There is also another non-ideal component in the circuit: the battery. All real power sources will have an internal resistance that will limit how much power you can get out of them. You can model the battery as a an ideal voltage source in series with a resistor.

(The answer to the important question of when you get the most power out of a battery is: when the external resistance in the circuit is equal to the internal resistance. SeeThis known as Impedance Matching.)

@SpehroPefhany is right about the LED. There is also another non-ideal component in the circuit: the battery. All real power sources will have an internal resistance that will limit how much power you can get out of them. You can model the battery as a an ideal voltage source in series with a resistor.

(The answer to the important question of when you get the most power out of a battery is: when the external resistance in the circuit is equal to the internal resistance. See Impedance Matching.)

  1. The internal resistance of the LED, as detailed by @SpehroPefhany
  2. The internal resistance of the battery.

All real power sources will have an internal resistance that will limit how much power you can get out of them. You can model the battery as a an ideal voltage source in series with a resistor.

(The answer to the important question of when you get the most power out of a battery is: when the external resistance in the circuit is equal to the internal resistance. This known as Impedance Matching.)

Source Link
SkyRate
SkyRate
  • 21
  • 2

@SpehroPefhany is right about the LED. There is also another non-ideal component in the circuit: the battery. All real power sources will have an internal resistance that will limit how much power you can get out of them. You can model the battery as a an ideal voltage source in series with a resistor.

(The answer to the important question of when you get the most power out of a battery is: when the external resistance in the circuit is equal to the internal resistance. See Impedance Matching.)