Work, Power and Energy
Electric Work is the process of
conversion of electrical energy to other form of energy.
Electric power (P) is
the amount of electric energy converted to
another form of energy in a given length of time.
Power represents the work
performed by an electric
circuit and is measured in watts (W). Power in an electric circuit is equal to
- Power
= voltage × current ,
- Watts = volts × amperes
- P = E.I
where
P = the
power in watts
E = the
voltage in volts
I = the
current in amperes
- Power can be measured using a wattmeter. The wattmeter is basically a voltmeter and ammeter combined into one instrument .
- The ammeter terminals are connected in series, and the voltmeter terminals are connected in parallel with the circuit in which the power is being measured.
- The wattage rating of a lamp indicates the rate at which the device can convert electric energy into light. The faster a lamp converts electric energy to light, the brighter the lamp will be.
Electric energy is a form of energy
that is absorbed by an electric circuit to do work or to convert energy one
form to other.
- The unit of energy, called the joule (J), joule is the amount of energy carried by 1 coulomb of charge propelled by an electromotive force of 1 volt.
- The watt-hour (Wh) is the more practical unit of measurement of electric energy.
- If power is measured in kilowatts and multiplied by hours, the result is kilowatt hours, abbreviated kWh or called as 1 Unit.
- Energy measurements are used in calculating the cost of electric energy.
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