arning Goal: To understand how to compute power dissipation in a resistive circuit.

The circuit in the diagram consists of a battery with EMF , a resistor with resistance , an ammeter, and a voltmeter. The voltmeter and the ammeter (labeled V and A) can be considered ideal; that is, their resistances are infinity and zero, respectively. The current in the resistor is , and the voltage across it is . The internal resistance of the battery is not zero.

The circuit in the diagram consists of a battery with EMF , a resistor with resistance , an ammeter, and a voltmeter. The voltmeter and the ammeter (labeled V and A) can be considered ideal; that is, their resistances are infinity and zero, respectively. The current in the resistor is , and the voltage across it is . The internal resistance of the battery is not zero.

## This question was asked on Mar 19, 2010.

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