Instructions:

• Recognize the givens and the unknowns.
• Listing concepts and principles to be used.
• Showing the basic equations related to the principles.
• Substituting the appropriate numerical values into the equations.
• Correct numerical answer and for proper unit
• Performing dimensional analysis throughout the problem.

A battery with an emf of 12.0V shows a terminal voltage of 11.6V when operating in a circuit with two lightbulbs, each rated at 4.0W (at 12.0V), which are connected in parallel.

What is the battery's internal resistance? Express your answer to two significant figures and include the appropriate units.