How Do I Calculate Power & Energy Density?
Two quantities that arise frequently in science include power and energy density. Power comprises the amount of energy a device uses or generates every second. The scientific unit for power is the watt and is equal to production or use of one joule of energy each second. An example is a 100-watt light bulb that consumes 100 joules of energy each second. Another interesting quantity is energy density, which measures the amount of energy stored in a given device or substance divided by its volume as in a gallon container of gasoline. Convert the number of kilowatt-hours of energy that the device used over a known amount of time by multiplying by 3.6 x 10^6. The symbol “^” denotes an exponent. A kilowatt-hour is the standard unit of energy used by electrical companies and is equal to 3.6 x 10^6 joules. For example, say your household uses 100 kilowatt-hours of energy in a given 30-day period. This is equivalent to 3.6 x 10^8 joules, since 100 times 3.6 x 10^6 equals 3.6 x 10^8. Convert th
