OHMS LAW AND POWER PHYSICS QUESTIONS?

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bulletime133

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A transistor radio operates by means of a 9.0 V battery that supplies it with a 50.0 mA current. If the cost of the battery is $0.90 and it lasts for 300 hours, what is the cost per kWh to operate the radio in this manner? the radio, now by means of converter, is plugged in by a homeowner who pays .08 per kWh. What does it now cost to operate the radio for 300 hours?

I know it's wordy but please help! i really appreciate it!
 
9V*(.05A)*300hrs/0.9$

Whatever pops out of your calculator.

The second one, you just need to take 9V*0.05A*300*0.08$/kW*hr

Learn DIMENSIONAL ANALYSIS

Trust me, learn it, it will do you so well in so many subjects (chem, physics, maths, )
 
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