No!. . . . . Well. . . . . not necessarily.
Despite what you might think less repetitions with heavier weight will burn more calories. The break you take in between sets is actually more important than the amount of repetitions. Lifting heavier recruits more muscle fibers to move the weight. The more muscle fiber recruited the more calories used to perform the lift and the more calories it takes to repair the damaged muscle (good damage).
Try it out by adapting your current workout program.
Cut your normal repetition totals in half and lift the heaviest weight you can without breaking form.
Now you must also cut your breaks in half (30 secs or less). You will be sure to break a sweat, a good indicator the body is burning more calories.
By Josh Gould