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4. To keep cool in the summer months, you decide to design and build your own hand-held fan. The fan’s electrical

4. To keep cool in the summer months, you decide to design and build your own hand-held fan. The fan’s
electrical circuit will run off of 4 AA batteries (each with a voltage of 1.5 V) and must not exceed 50 mA of
current. You visit your local Radio Shack and find that resistors are sold in five varieties: 5 Ohm, 10 Ohm, 12
Ohm, 20 Ohm, 50 Ohm. Each resistor costs 8 cents. What set of resistors should you buy to minimize cost?

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