In an Emergency You Need to Power a Radio That

question 16

Multiple Choice

In an emergency you need to power a radio that uses 25 W of power when attached to a 6.0-V power supply.The only power supply you have access to provides 120 V,but you do have a very large number of 4.0-ohm resistors.If you want the power in the radio to be as closes as possible to 25 W,how many resistors do you need to use?

• A)5
• B)7
• C)10
• D)120
• E)144

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