How much does it cost to operate a 25-W soldering iron for 8.0 hours if energy costs 8.0¢/kWh?
A)$1.50
B)25¢
C)16¢
D)1.6¢

Name: How much does it cost to operate a 25-W soldering iron for 8.0 hours if energy costs 8.0¢/kWh? A)$1.50 B)25¢ C)16¢ D)1.6¢
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Question

Quizplus · Accepted Answer

The energy used by the soldering iron is:$$E = Pt = (25 	ext{ W})(8.0 	ext{ h}) = 200 	ext{ Wh} = 0.200 	ext{ kWh}$$The cost of this energy is:$$C = E 	imes r = (0.200 	ext{ kWh})(8.0¢/kWh) = 1.6¢$$

How Much Does It Cost to Operate a 25-W Soldering