which means that power is being used at the rate of 1000 watts per hour. For example, a 600-watt electric ... If she uses the iron 4^ hr. a week, how much, to the nearest cent, does the electricity cost per week ? 2. It costs Mrs. Modern 1.80 peranbsp;...
|Author||:||David Eugene Smith, Eva May Luse, Edward Longworth Morss|