show all your work I If electrical energy costs 14 cents per

show all your work

I If electrical energy costs 14 cents per kilowatt-hour, how much does it cost to burn a 750-W light builb for 24 h? Operate an electric aven for 6.0 h if it carries a current of 25 A at 240 v? ISV E08 17.34) 8. 24 h cost a. 0.1989 dollars b. 0.2884 dollars d. 0.2520 dollars e.0.2671 dollars t. 0.2319 dollars c. 0.2333 dollars 9. 6.0h cost a. 5.040 doilars b 4.746 dollars c. 5.794 dollars d. 4.676 dollars e. 4.128 dollars f. 6.172 dollars

Solution

Power of light bulb P = 75 W

Time t = 24 h

Energy E = Pt

              = 75 W x 24 h

              = 1800 Wh

              = 1.8 kWh

Cost per kWh is = 14 cents

So, cost of 1.8 kWh = 1.8 x14 cents

                              = 25.2 cents

                              = 0.252 dollars

(b). Current i = 25 A

Voltage V = 240 volt

Power P = Vi

             = 240 x 25

             = 6000 W

Time t = 6 h

Energy E = Pt

              = 6000 W x 6 h

              = 36000 Wh

              = 36 kWh

Cost per kWh is = 14 cents

So, cost of 36 kWh = 36 x14 cents

                              = 504 cents

                              = 5.04 dollars