Among the variations on the graphs of the trigonometric functions are shifts--both horizontal and vertical. Such shifts are easily accounted for in the formula of a given function. Take function f, where f (x) = sin(x) .
The running costs vary from gas to electric. The average running cost for an electric water heater is $550. The average running costs of a gas water heater is $400. The difference in usage price per year is $150.
Calculating Energy Usage. An average water heater runs three hours daily. An 50-gallon, 5,500-watt water heater with a .90 EF and an electricity rate of $.16 per kilowatt hour will cost $781 to operate each year.Most water heaters include a label listing the annual operating cost.or electric heaters, EF ranges from 0.75 to 0.95. The amount of electricity used by an electric water heater depends on the size of the water tank, the amount of water used, the temperature setting of the water heater, and whether the tank is insulated.