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Kilowatt-hour (kWh) is a unit of?
Current
Power
Energy
Resistance
Energy
The Kilowatt-hour (kWh) is a unit of electrical energy, representing the amount of energy consumed by a device with a power rating of one kilowatt operating continuously for one hour. It is a commercial unit of energy, often referred to as a 'Board of Trade' (BOT) unit.
The Kilowatt-hour (kWh) is a unit of electrical energy, representing the amount of energy consumed by a device with a power rating of one kilowatt operating continuously for one hour. It is a commercial unit of energy, often referred to as a 'Board of Trade' (BOT) unit.
E=P├Чt тАФ Energy equals power multiplied by time
1┬аkWh=1000┬аW├Ч3600┬аs=3.6├Ч10┬░6┬аJ тАФ Conversion to SI base units
Energy is defined as the integral of power over time, expressed as E=тИлP(t)dt. For a constant power source, this simplifies to E=P├Чt. Since power P is in kilowatts (kW) and time t is in hours (h), the resulting unit is kWh, which is equivalent to 3.6├Ч10┬░6 Joules (Watt-seconds).
kWh measures the total amount of work done or energy consumed.
It is the standard unit for domestic and industrial electricity billing.
It is NOT a unit of power; power is measured in Watts (W) or Kilowatts (kW).
Energy is a scalar quantity.
Provides a practical, human-readable scale for electrical consumption.
Easily convertible to SI units (Joules) for scientific calculations.
Often confused by laypersons with power, leading to errors in load calculation.
Represents a large magnitude of energy, not suitable for atomic or subatomic physics.
Electrical utility billing (electricity meters).
Rating of battery capacities in electric vehicles (EVs).
Estimation of home appliance energy consumption.
The kilowatt-hour is a non-SI unit but is widely accepted for use with the SI.
Option A (Current) is measured in Amperes (A).
Option B (Power) is measured in Watts (W) or kW.
Option D (Resistance) is measured in Ohms (╬й).
C is correct тАФ Kilowatt-hour (kWh) is a unit of energy derived from the product of power (kilowatts) and time (hours).
Always differentiate between rate-based units (Power, W) and cumulative-based units (Energy, Wh/kWh). If the unit has 'time' as a factor in the numerator, it is likely Energy.