Define 1 kilowatt hour?

Question

Answer

Answer

1 Kwh can be defined as the amount of electrical energy consumed when a 1000 watt electrical appliance is used for an hour.

The unit of energy is watt. 1 Watt = 1 Joule /second.

Answer

1 Kwh can be defined as the amount of electrical energy consumed when a 1000 watt electrical appliance is used for an hour. The unit of energy is watt. 1 Watt = 1 Joule /second. One kilowatt hour is 3.6 megajoules. It is the amount of energy converted if work is done at the rate of 1000 watts per hour.

Answer

Kilowatt-hour is an energy unit (symbol kWh or kW⋅h).

One kilowatt-hour is defined as the energy consumed by power consumption of 1kW during 1 hour:

1 kWh = 1kW ⋅ 1h

One kilowatt-hour is equal to 3.6⋅106 joules:

1 kWh = 3.6⋅106 J

The energy E in kilowatt-hour (kWh) is equal to the power P in kilowatts (kW), times the time t in hours (h).

E(kWh) = P(kW) ⋅ t(h)

hope it will help u :)

Answer

1 Kilowatt Hour:

A kilowatt hour (kWh) is a unit of energy commonly used to measure the amount of electricity consumed over a period of time. It is a derived unit that combines power (kW) and time (hour) to quantify the total energy consumed. Here, we will provide a detailed explanation of what a kilowatt hour is and how it is calculated.

Understanding Power:
- Power is the rate at which energy is used or transferred. It is measured in watts (W), and kilowatts (kW) represent a larger unit of power, where 1 kilowatt is equal to 1,000 watts.
- Power is typically associated with electrical devices, such as light bulbs, appliances, and motors. Each device has a power rating, indicating the amount of power it consumes when operating.

Time as a Factor:
- Energy consumption is not solely dependent on power; the duration of usage is also crucial. For example, a device consuming 1 kilowatt of power for 1 hour would consume 1 kilowatt hour of energy.
- Time is measured in hours, and to calculate the energy consumed, the power in kilowatts is multiplied by the time in hours. This results in the unit kilowatt hour (kWh).

Calculation:
The formula for calculating the energy consumed in kilowatt hours is as follows:
Energy (kWh) = Power (kW) x Time (h)

Example:
Let's consider an example where a 100-watt light bulb is used for 5 hours.
1. Convert the power to kilowatts: 100 watts ÷ 1000 = 0.1 kW.
2. Multiply the power by the time: 0.1 kW x 5 hours = 0.5 kWh.
Therefore, the energy consumption of the light bulb is 0.5 kilowatt hours.

Significance and Usage:
- Kilowatt hours are widely used by utility companies to measure and bill for electricity consumption. Household electricity bills often display the amount of energy consumed in kilowatt hours.
- It helps consumers track their energy usage, make informed decisions regarding their electricity consumption, and manage their energy costs efficiently.
- Kilowatt hours are also used in discussions about renewable energy generation and carbon footprints, as they provide a standardized unit to assess and compare energy consumption and production.

In summary, a kilowatt hour is a unit of energy that combines power and time to measure the total electricity consumed. It is calculated by multiplying the power in kilowatts by the time in hours. Understanding kilowatt hours is essential for monitoring energy usage, managing costs, and promoting energy efficiency.

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What is the kilowatt-hour consumption of a 40 W lamp if it remains on for 1750 h ?

Commercial unit of electric energy is

What is the kilowatt-hour consumption of a 40 W lamp if it remains on for 1750 h? A: 43.75 B: 70 C: 43,750 D: 70,000 Correct ans is B).explain?

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