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

Question

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

Quizplus · Accepted Answer

First, convert the power of the soldering iron to kilowatts: 25 W = 0.025 kW. Then, multiply by the time in hours to find the energy used: 0.025 kW * 8.0 hours = 0.2 kWh. Finally, multiply by the cost per kWh: 0.2 kWh * 8.0¢/kWh = 1.6¢.

How Much Does It Cost to Operate a 25-W Soldering 16ϕ16 \phi16ϕ

How Much Does It Cost to Operate a 25-W Soldering $16 \phi$