Cost of a energy from a battery

Thread starter haleyscavone
Start date Dec 4, 2008
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Battery Energy

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To calculate the cost per kWh for operating a transistor radio with a 9.5 V battery supplying 58 mA, first determine the power in watts using the formula Watts = Volts x Amps, resulting in 0.551 Watts. Over 300 hours, the total energy consumed is 0.551 Watts x 300 hours = 165.3 Wh, or 0.1653 kWh. The cost per kWh is then calculated by dividing the battery cost of $0.85 by the energy consumed in kWh, resulting in approximately $5.15 per kWh. A kilowatt-hour (kWh) is a unit of energy equivalent to one kilowatt of power used for one hour. Understanding these calculations is essential for evaluating the cost-effectiveness of battery-operated devices.

Dec 4, 2008

haleyscavone

A transistor radio operates by means of a 9.5 V battery that supplies it with a 58 mA current.

(a) If the cost of the battery is $0.85 and it lasts for 300 h, what is the cost per kWh to operate the radio in this manner?

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Dec 4, 2008

mgb_phys

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You have to make an attempt at the question!
How do you calculate Watts form volts and amps?
What is a KWh?

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