Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > If a 100 watts bulb is used for 10 hours, the...
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If a 100 watts bulb is used for 10 hours, then the amount of consumed electrical energy will be -
- a)100 Watts
- b)100 Watts per hour
- c)1000 Watts (1 KW)
- d)1 KWh (1 unit of electricity)
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
If a 100 watts bulb is used for 10 hours, then the amount of consumed ...
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
- If we consider the bulb as a resistor then, we can easily find the current and voltage drops.
- Power consumed = 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
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If a 100 watts bulb is used for 10 hours, then the amount of consumed ...
Calculating Consumed Electrical Energy
- Given: 100 watts bulb used for 10 hours
- Formula: Energy (kWh) = Power (kW) x Time (hours)
Calculations:
- Power (kW) = 100 watts / 1000 = 0.1 kW
- Time (hours) = 10 hours
Substitute values into formula:
Energy (kWh) = 0.1 kW x 10 hours = 1 kWh
Therefore, the amount of consumed electrical energy will be 1 kWh (1 unit of electricity).
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