DC Circuit Problems

11.9 Energy and Power in Electrical Circuits

Rate of delivering electrical energy or power input to a circuit element is

where V is the voltage across its terminals and I is the current flowing through it.

Power delivered to a resistor is

Power output of a source of is

11.9.1 Maximum Power Transfer Theorem
The maximum power is transferred to an external resistor if its resistance is equal to the internal resistance of the cell or battery.

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