The cost of running five 60 W lamps and four 100 W lamps for 20 hours if electrical energy cost #10.00 per kwh is

Dukeman01

2 years ago

Total power= 5×60 + 4×100
= 300+400= 700W
we do, 700×20/1000= 14,000/1000= 14
so, 14*10=N140

meremeking

3 months ago

power equals to 5 Ash 60 plus 4 Ash 100 = 300 + 400 equals to 700w / 1,000 to convert to kilowatts is equals to 0.7 kW for 20 hours 0.7 ash20 because of 14 kW h but 10 Ash is equals to therefore 14 star 10 equals to 14 kwh is equal to 140the correct answer should be d I think I support you

idris.musa

12 years ago

total power=5*60+4*100=300+400=700w..divide by 1000 to convert to kilowatt(kw)=0.7kw for 20hrs..0.7*20=14kwh..but 10#=1kwhtherefore 14*10#=14kwh=140# the correct answer is D

2007teddy

4 months ago

am confused

Vic.Last

12 years ago

pls, someone should elaborate d workings.

Tezzyspice

4 months ago

No answer

Eyitayo090

5 years ago

Conversion of watt to kilowatts is divided by 1000 not 100

manfulicthub

4 months ago

am confused