The current in a 120-V reading lamp is <FONT color=red>2.7</FONT> A. If the cost

Question

The current in a 120-V reading lamp is <FONT color=red>2.7</FONT> A. If the cost of electrical energy is <FONT color=red>$</FONT><FONT color=red>0.060</FONT> per kilowatt-hour, how much does it cost to operate the light for an hour? (Do not round to the nearest cent.) <BR>$<SPAN class=qTextField><INPUT id=RN_1130675_5_0_1139891 dir=ltr size=10 name=RN_1130675_5_0_1139891 autocomplete="off"></SPAN><BR>

Explanation / Answer

The potential difference across the reading lamp is V = 120-V The current through the reading lamp is I = 2.7 A The cost of electrical energy is 0.060 per kilowatt-hour = 0.060 * 10-3 (watt-hour)-1 The power consumed by the light bulb is P = V * I or P = 120 * 2.7 = 324 watt The cost to operate the light for an hour is A = P * 0.060 * 10-3 = 324 * 0.060 * 10-3 = $0.01944

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