Question

A standard flashlight battery can deliver about 2 W·h of energy before it runs down.

A standard flashlight battery can deliver about 2 W·h of energy before it runs down.
(a) If a battery costs US $0.95, what is the cost of operating a 60 W lamp for 9 h using batteries?
$

(b) What is the cost if energy provided at the rate of US$0.06 per kilowatt-hour is used?
$

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