Generally power 'P' is the amount of energy transferred in 1 second 'S' .so the formula will be like this
The unit for power is Watt (W). In electrical appliance 1 Watt is the power which can produce a total energy of 1Js-1.For an electrical motor, 1 hp is 745.7 W. to calculate the value for electrical power it can be derive as P = VxI
This triangle will help you to calculate the value of power easily. Lets see some examples.
A electric motor label 12V and 15W. find the value of current and resistance.
1) Value of current : I= P/V
I=15/12
1.25A
2) Value of resistance : For value of resistance, you need to use Ohms law.
R = V/I
R= 12/1.25
9.6 Ω
Easy right. So lets figure it out about the cost of the electrical energy. The unit used to calculate the cost of electrical energy is kilowatt-hour (KWh). Every house have a meter that calculate the cost of energy consumption in your house. 1 KWh is the total energy consumed by an electrical appliance of power 1 Kw in 1 hour. so :
1 KWh X 1hour
1000Js-1 X 3600s
= 3.6 x10^6 J
To calculate the energy consumption, this formula are used Energy= Power X Time
For example a television set of power 700W is switched on for 6 hours a day. Calculate the cost of electrical energy.
To calculate the cost of electrical energy you need to change 700W into KWh. So :
700/1000 = 0.7 KWh
Cost of electrical energy : Energy = Power X Time
0.7KWh X 6h
= 4.2KWh.
So easy right. This is how your house electrical cost are calculate it. To reduce the cost of electrical bill you need to use low powered electrical appliance like 15W light bulb or fluorescent light.
If you reduce the electrical cost, You will save some pocket money too!!
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