Power is the rate of doing work, or the rate at which energy is produced or consumed. It is defined as the amount of electric energy consumed in a circuit per unit time.
If W be the amount of electric energy consumed in a circuit in t seconds, then the electric power is given by
But electrical energy can be defined as
According to Ohm s law,
Substituting the value in the equation we get
The SI unit of electric power is watt (W).
Electric power is said to be1 watt, if 1 ampere current flows through a circuit having 1 volt potential difference.
i.e.,
Bigger units of power are as given below:
1 kilowatt (kW) =
1 megawatt (MW) =
1 gigawatt (GW) =
2. Practical unit of power is horse power.
1 HP = 746 W
3. Commercial unit of electrical energy
4. Number of units consumed by electric appliances is
No electrons are not consumed in an electric circuit. We pay the electricity board or electric company to provide energy to move electrons through all the electric gadgets like fan, bulb, refrigerator, etc. installed in our homes. We pay for the electricity that we use.
Illustration: An electric refrigerator rated 500W operates 6 hours/day. What is the costof the energy to operate it for 30 days at Rs. 4.5 per kWh?
Solution: Energy consumed by refrigerator in 30 days
Cost of energy to operate the refrigerator for 30 days
An electric bulb is rated 220 volt and 80 watt.power consumed by it when oprated on 110 volt is:- | |||
Right Option : D | |||
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An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it ? | |||
Right Option : D | |||
View Explanation |
Which of the following term represent electrical power in a circuit? | |||
Right Option : D | |||
View Explanation |
Third consective year,my ward is in Abhyas with nice experience of admin and transport support.Educational standard of the institute recumbent at satisfactory level. One thing would live to bring in notice that last year study books was distributed after half of the session was over,though study ...
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