A steam iron draws 6.5 A when connected to a potential difference of 120 V.
(a) What is the power rating of this iron?
1 W
(b) How many joules of energy are produced in 20.0 min?
2 J
(c) How much does it cost to run the iron for 20.0 min at $0.014/kW·h?
$ 3
4 answers
I got A and B i cant figure out C
P=I•U =6.5•120 =780 W,
E= P•t = 780•20•60 =9.36•10^5 J.
1J = 2.7•10^-7 kWh.
E = 0.26 kWh.
Cost = 0.26•0.014 =3.64•10^-3 $
E= P•t = 780•20•60 =9.36•10^5 J.
1J = 2.7•10^-7 kWh.
E = 0.26 kWh.
Cost = 0.26•0.014 =3.64•10^-3 $
the third answer is supposed to be in $
$3.64•10^-3 =$0.00364 =0.367 ¢
1 answer