Search results
By the end of this section, you will be able to: Express electrical power in terms of the voltage and the current. Describe the power dissipated by a resistor in an electric circuit. Calculate the energy efficiency and cost effectiveness of appliances and equipment.
This is how the cost of the electricity used is calculated: \ (\text {units used (kWh)}= {\text {power (kW)}}\times {\text {time (h)}}\) \ (\text {cost}= {\text {units used}}\times...
The energy unit on electric bills is the kilowatt-hour (kW ⋅ h kW ⋅ h), consistent with the relationship E = Pt E = Pt. It is easy to estimate the cost of operating electric appliances if you have some idea of their power consumption rate in watts or kilowatts, the time they are on in hours, and the cost per kilowatt-hour for your electric ...
Energy suppliers calculate the cost of gas and electricity used by: Units of energy used (kWh) = power used (kW) × time (hours) Then the cost of that energy use can be calculated: Cost (£) = units used (kWh) × cost per unit (£ per kWh) Suppliers have different price plans called tariffs.
16 sie 2021 · To find the operating cost, we first find the energy used in kilowatt-hours and then multiply by the cost per kilowatt-hour. Solution. The energy used in kilowatt-hours is found by entering the power and time into the expression for energy: \[E = Pt = \left(60 W\right)\left(1000 h\right) = 60,000 W \cdot h.\] In kilowatt-hours, this is \]E = 60 ...
The cost of the electricity used is calculated using this equation: total cost = number of units used × cost per unit. The cost per unit is set by the electricity company, for...
The energy unit on electric bills is the kilowatt-hour (kW ⋅ h), consistent with the relationship E = Pt. It is easy to estimate the cost of operating electric appliances if you have some idea of their power consumption rate in watts or kilowatts, the time they are on in hours, and the cost per kilowatt-hour for your electric utility.
