# how can energy be measured Watts

• ### How do you measure energy and power in physics?

• Measuring Energy and Power. Energy, which is the capacity of a physical system to do work, is measured in joules (J) or watt-hours (Wh), with 1 watt-hour equal to 3,600 joules. 鈥淓ven with a perfect machine, energy efficiency is always less than 100%.鈥?

• ### What is the unit of measurement for energy?

• Voltage creates an electrical current by moving electrons through a conductor. Once energy sources have gone through the needed combustion, transformation, or conversion to be used by us in our homes, it鈥檚 measured in kilowatt hours. Going back to the SI energy derived units, remember that a Watt is the unit of measurement for power.

• ### Why is energy measured in kilowatts?

• Once energy sources have gone through the needed combustion, transformation, or conversion to be used by us in our homes, it鈥檚 measured in kilowatt hours. Going back to the SI energy derived units, remember that a Watt is the unit of measurement for power.

• ### How is the amount of electricity used over time measured?

• Electricity use over time is measured in Watthours A Watthour (Wh) is equal to the energy of one Watt steadily supplied to, or taken from, an electric circuit for one hour. The amount of electricity that a power plant generates or an electric utility customer uses is typically measured in kilowatthours (kWh).