# a 10 watt bulb runs for 10 hours in a day. how much energy would it consume in a day

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## [Solved] If a 100 watts bulb is used for 10 hours, then the amount of

The correct answer is 1 KWh. Concept: Electric bulb: It is an electric device that converts electric energy into heat and light energy. Resistanc

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## If a 100 watts bulb is used for 10 hours, then the amount of consumed electrical energy will be -

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100 Watts 100 Watts per hour 1000 Watts (1 KW)

1 KWh (1 unit of electricity)

## Answer (Detailed Solution Below)

Option 4 : 1 KWh (1 unit of electricity)

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## Detailed Solution

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The correct answer is **1 KWh.**

Concept:

Electric bulb: It is an electric device that converts electric energy into heat and light energy.

Resistance of the bulb

R=(Ratedvoltage)2(Ratedpower)

If we consider the bulb as a resistor then, we can easily find the current and voltage drops.

Powerconsumed=i2R

Power consumed ∝ Brightness

The rate of work done by the electric current is called as electric power.

The difference of potential between two points is called a potential difference.

Electric energy (E) = electric power (P) × time (t)

Unit of electric energy = unit of electric power × unit of time = kilowatt × hour = kilowatt-hour

Key Points Given that

Power of the bulb = 100 W

Time = 10 hours We know that,

Energy = Power × Time

⇒ Energy consume = 100 w × 10 hrs = 1000 watt - hr = **1 KWh.**

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## What would be the electric energy consumed in 10 days, if a 10 watts LED bulb is used 10 hours per day?

Answer (1 of 6): Electrical Energy consumption is practically in many countries around the world measured in Kilowatt-hours or kWh. 10 hours for 10 days with power rating of 10W Electrical Energy = 10 Watts ☓ 10 hours ☓ 10 days Electrical Energy = 1000 Watt-hours Electrical Energy = 1 kWh Th...

What would be the electric energy consumed in 10 days, if a 10 watts LED bulb is used 10 hours per day?

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The electric energy consumed in 10 days would be 10 watts x 10 hours/day x 10 days = 1000 watt hours or 1 kilowatt hour.

Chris N. Tyler

Auditor at Deloitte (company) (2016–present)Author has 111 answers and 142K answer views5y

Electrical Energy consumption is practically in many countries around the world measured in Kilowatt-hours or kWh.

10 hours for 10 days with power rating of 10W

Electrical Energy = 10 Watts ☓ 10 hours ☓ 10 days

Electrical Energy = 1000 Watt-hours

Electrical Energy = 1 kWh

Therefore from your question, the bulb will consume one unit ( 1 kWh) of electrical energy measured in kWh assuming no other resistive loses through the connection wires.

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If this is a homework question, it must have been set for an “Electricity for Jocks” course. For the benefit of all college athletes out there, let me rephrase it in a slightly simpler way. Spit your chewing gum out before trying to answer, as I realize it’s difficult to do two things at once.

What is 10 x 10 x 10 x Watts x Hours?

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One kilowatt-hour (1 kWh).

10 days times 10 hours/day = 100 hours

10 watts times 100 hours = 1000 watt-hours = 1 kilowatt-hour

Richard Perry 8mo

It depends on the power factor of the LED lamp

Assuming PF=1 then ((10*10*10/1)/1000) KWHr - so = 1KWHr

Assuming PF=0.5, then this is ((10*10*10/0.5)/1000) = 2KWHr

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Christopher Wright

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Formula: E = P x t, P = watts, E = energy in kWh, t = time in hours

E = 10W x 100 hrs = 1 kWh

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Try it if you had not replaced the old fashioned incandescent bulb with a modern LED bulb. The old bulb would draw 60 watts instead of 10 watts. See how much you saved by switching to LED bulbs? You may have saved a pound of coal.

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## kW vs. kWh: How much energy is my lighting using? [Calculator]

How does lighting affect your electricity bill? You must understand kilowatts (kW) and kilowatt hours (kWh). Use our calculator to convert kW to kWh.

## kW vs. kWh: How much energy is my lighting using? [Calculator]

Posted by Andrew Thomas on October 14, 2019

How much energy does a light bulb use, and how does lighting affect your electricity bill? How much will a lighting retrofit save you? How do you begin to estimate the value of a potential lighting rebate?

How does lighting affect your electricity bill? How much will a lighting retrofit save you? How do you begin to estimate the value of a potential lighting rebate?

There’s one common thread that runs through each of these questions: the difference between watts (W), kilowatts (kW), and kilowatt-hours (kWh). Calculating watts to kWh could help you understand the answers to the questions above.

The energy industry is almost as bad as the lighting industry at using abbreviations and jargon, so we’ll try to break each of these down with some practical examples.

In this article, I’m going to use the analogy of equating electricity to water. This is a common analogy that we can’t claim as our own, but hopefully our specific examples will help explain how much energy lighting really uses.

If you already know the difference between kW and kWh, click here to jump ahead to the calculator.

## What is a watt (W)?

You’ve probably made a lot of lighting decisions based on wattage. You unscrew a burned out light bulb and look at the top and see “60W.” All you have is a light bulb labeled “25W,” so you screw it in, and to your dismay, it’s way too dim. You go to the store and pick out a “60W” bulb. Your lights are bright again. Crisis averted.

So what is a watt, anyway? Technically speaking, it's a unit of electrical power equal to 1 joule per second. Light bulbs are rated in watts to indicate how much energy they consume.

Does the wattage of a light bulb have anything to do with brightness? Well, sort of.

For so long, many of us have associated watts with the amount of light a bulb gives off. In general, that works well with traditional incandescent light bulbs. A 60W incandescent bulb typically gives off around 650-800 lumens. A 25W incandescent bulb typically produces around 150 lumens — much less light.

With the introduction of more efficient lighting, though, it’s not uncommon to see a “60W equivalent” bulb that uses far less energy and gives off roughly the same amount of light. Here’s a breakdown:

**Incandescent**

**Halogen**

**CFL**

**LED**

**Wattage**60W 42W 13-16W 5-9W

**Lumens per watt (LPW)**13 18.5 60 75-100+

(The photos above are representative of the technology, not specific product specifications.)

So, as you are comparing light bulbs, remember that wattage is a measure of how much energy the light bulb will use as it produces light, and the lumens will give you a measure of how much light it will produce.

Ready to shop light bulbs? Click here and use the filters on the left to sort by lumens.

## What is a kilowatt (kW)?

Just like watts, kilowatts is a measure of how much energy something will consume. Going from watts (W) to kilowatts (kW) is a pretty straightforward calculation: 1kW is equal to 1,000W. To convert W to kW, divide the total wattage by 1,000.

Here’s an example: if you turned on ten 100W light bulbs, that would equal 1kW of energy usage.

10 bulbs x 100W = 1,000W

1,000W / 1,000 = 1kW

It’s also worth noting that kW can be synonymous with “demand” if you’re talking to a utility company. Imagine that you turn on those ten light bulbs and a 3,000-watt clothes dryer at the same time. The utility company needs to be able to supply enough electricity to meet that 4kW of demand at the moment you turn everything on.

Your energy usage, though, depends on how long you keep everything on, which leads us to…

## What is a kilowatt-hour (kWh)?

What’s the difference between kW and kWh? The kWh measurement is a way to quantify how much energy is used over a period of time. This can be calculated by multiplying the kW of energy consumption by the total number of hours the lighting has been operated.

Let’s go back to the example of having ten 100W light bulbs. How much energy would you use of the course of a month if you turn them on for 10 hours a day?

That’s where kWh comes into play. Here’s the breakdown:

10 bulbs X 100W = 1,000W or 1kW of lighting

10 hours of daily use X 30 days in the month = 300 hours of use

1kW X 300 hours of use = 300kWh of energy consumption

So why is kWh so important if you can compare lighting products based on wattage and light output? In the end, a significant portion of your electricity bill is based on your energy consumption in kilowatt-hours. If you want to calculate the dollar savings you’ll get from a retrofit to more efficient lighting, kWh will come into play.

Guys, does anyone know the answer?