Gas is cheaper to drive. But, in terms of efficiency electric heater is more efficient.
Electricity is produced from natural gas.
There is no free energy.
Efficiency can be expressed in different ways.
Efficiency = (desired output) / (required input)
Efficiency of a refrigerator = (heat output)/(energy input)
SI units of power are J, KJ, cal.
If energy is in joules,
Power = ((joule) / (second)) = watt
Quality vs. Quantity
Not all energy and material sources are created equal
Energy has high quality and quantity
Quality if energy source is measured by the temperature it produces
Water has quantity and quality
Steam has quality and quantity
Quality of steam is measured b