ELECTRIC POWER
- In general, power is defined as the rate of doing work or rate of spending energy. Similarly, the electric power is defined as the rate of consumption of electrical energy.
- It represents the rate at which the electrical energy is converted into some other form of energy.
- Suppose a current I flows through a conductor of resistance ‘R’ for a time ‘t, then the potential difference across the two ends of the conductor is ‘V.
- The work done ‘W’ to move the charge across the ends of the conductor is given by:
W= V I t, Power P = Work/ Time = V I t / t
P = V I
HORSEPOWER:
- The horsepower (hp) is a unit in the foot-pound-second (fps) or English system, sometimes used to express electric power.
- It is equal to 746 watts.
Unit of Electric Power
- The SI unit of electric power is watt.
- When a current of 1 ampere passes across the ends of a conductor, which is at a potential difference of 1 volt, then the electric power is
P = 1 volt x 1 ampere = 1 watt
- Thus, one watt is the power consumed when an electric device is operated at a potential difference of one volt and it carries a current of one ampere.
- A larger unit of power, which is more commonly used is kilowatt.
Also Read
- Elements and Compounds / தனிமங்களும் சேர்மங்களும்
- Carbon / கார்பன்
- Nitrogen and their compounds / நைட்ரஜன் மற்றும் அதன் சேர்மங்கள்
- Fertilizer / உரங்கள்
- Pesticides / களைக்கொல்லி
- Insecticides / பூச்சிக்கொல்லி
- Blood and blood circulation / இரத்தம் மற்றும் இரத்த சுழற்சி மண்டலங்கள்
- Endocrine system reproductive system / நாளமில்லா சுரப்பி மண்டலம், இனப்பெருக்க மண்டலம்
- Nature of universe / பேரண்டத்தில் இயல்புகள்
- General Scientific Law / பொது அறிவியல் விதிகள்
- Heat, Light and Sound / ஒளி,ஒலி மற்றும் வெப்பம்