Which of the following is the commercial unit of electric energy which is commonly known as ‘units’ in electricity bills? 

The correct answer is kilowatt hour (kWh).

Key Points

• The kilowatt hour (kWh) is the standard unit of measurement for electrical energy used by consumers.
• It is commonly referred to as a "unit" in electricity bills issued by utility companies.
• 1 kilowatt hour is equal to the amount of energy consumed by a 1,000-watt appliance running for one hour.
• This unit helps in quantifying electricity consumption and is crucial for calculating electricity costs.

Additional Information

• Ampere hour (Ah): A unit of electric charge, often used in measuring the capacity of batteries. It indicates the amount of charge flowing in one hour at a current of one ampere.
• Voltage: The electric potential difference between two points. It is measured in volts (V) and drives the current through a circuit.
• Watt (W): A unit of power, equivalent to one joule per second. It measures the rate of energy conversion or transfer.
• Energy Consumption: The total amount of energy used by electrical devices or systems, typically measured in kilowatt hours (kWh) for billing purposes.
• Utility Meters: Devices installed by utility companies to measure the amount of electricity consumed by households or businesses. These meters record the energy usage in kilowatt hours (kWh).