Power is defined as the ability to act or have influence over others. An example of power is the strength needed to run five miles. An example of power is the authority a local government has to collect taxes. noun.

Joule is the smallest unit of energy. But for some bigger calculation, some better unit is required. So, the unit used for electrical energy is watt-hour. Watts are the basic unit of power in which electrical power is measured or we can say that rate at which electric current is being used at a particular moment.

The S.I unit of power is Watt(W) which is joule per second.

P = W / t. The standard metric unit of power is the Watt. As is implied by the equation for power, a unit of power is equivalent to a unit of work divided by a unit of time. Thus, a Watt is equivalent to a Joule/second.

Power (P) is the rate at which energy is transferred or converted. Thus, power equals work divided by time (P = W / t). The SI unit of power is the watt (W), in honor of Scottish inventor James Watt (1736 – 1819). One watt equals one joule per second (W = J / s).

Watt

In her book, Lipkin writes about these specific types of power and why it’s important for leaders to understand what type of power they’re using.

• Legitimate Power.
• Coercive Power.
• Expert Power.
• Informational Power.
• Power of Reward.
• Connection Power.
• Referent Power.

Calculating an Electrical Load in a Simple Circuit Let Power = Voltage * Current (P=VI). Let Current = Voltage/Resistance (I=V/R). Apply Kirchoff’s Second Law, that the sum of the voltages around a circuit is zero. Conclude that the load voltage around the simple circuit must be 9 volts.

Ohms Law and Power

1. To find the Voltage, ( V ) [ V = I x R ] V (volts) = I (amps) x R (Ω)
2. To find the Current, ( I ) [ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)
3. To find the Resistance, ( R ) [ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)
4. To find the Power (P) [ P = V x I ] P (watts) = V (volts) x I (amps)

How to size a UPS

1. List all equipment to be protected by the UPS.
2. List the amps and volts for each device.
3. Multiply the VA by the number of pieces of equipment to get the VA subtotals.
4. Add the VA subtotals together.
5. Multiply the total by 1.2 to get the grand total.
6. Use the grand total to select a UPS.

I= P/(1.732*V*Cos pi) Here three-phase full load current is equal to the power divided by 1.732 times of line to line voltage and power factor.

To convert A to kVA in a three-phase circuit use the following formula. kVA is equal to the square root of 3 (1.732) times amps times volts, divided by 1,000. For example, find the apparent power in kVA for 440 volt three-phase circuit with 150 amps of current.

1,000 Volt

GENERATOR AMP RATINGS – THREE PHASE EXTENDED

Three Phase Transformer

Units. The dimension of power is energy divided by time. In the International System of Units (SI), the unit of power is the watt (W), which is equal to one joule per second. Other common and traditional measures are horsepower (hp), comparing to the power of a horse; one mechanical horsepower equals about 745.7 watts.

Joule

Watts (W) and Kilowatts (kW): Watts are the SI unit of power. Kilowatts are equivalent to 1,000 Watts and are the most frequently used unit of electrical power. Power in general is defined as energy over time. Watts are defined as 1 Watt = 1 Joule per second (1W = 1 J/s) which means that 1 kW = 1000 J/s.

The revised tariff for domestic consumers in urban areas will be Rs. 2.50 per unit up to 30 units, Rs. 3.70 per unit for consumption between 31 and 100 units, Rs. 4.85 per unit for consumption between 101 and 200 units and Rs.

Just like the odometer on your vehicle that shows the actual distance travelled by the vehicle, electricity meter shows the amount of electricity that is used. So a 100-Watt bulb if kept on for 10 hours will consume: 100 x 10 = 1000 Watt-Hour = 1 Kilowatt-Hour (kWH) = 1 units (on your meter).

Your electricity company charges by how much electricity you use per kilowatt hour (kWh). To put it simply, this means it measures the number of kilowatts you use over time. For example: A 100 watt light bulb uses 0.1 kilowatts each hour. It would take 10 hours for the light to consume 1 kWh of energy.

ten hours

Calculate Your Electricity Bill in 1 min by Simple Calculation. Electric Energy Bill Calculator

1. Example:
2. Total Consumed Units = 720.
3. E = P x t … ( Wh)
4. E = P x t ÷ 1000 … ( kWh)
5. Consumed Energy = Energy Used in Watts x Time in Hours.
6. E = P x t … ( Wh)
7. E = P x t ÷ 1000 … (
8. Energy Cost = Energy Used in kWh x Time in Hours.

3.60 per unit to Rs. 3.85 per unit and for consumption between 31 to 100 units, the tariff is increased from Rs. 4.90 per unit to Rs. 5.15 per unit.

Choose clean energy and savings, now.

1. Current meter reading – Meter reading reported from last month’s bill = Total kWh used since last reading.
2. Total kWh used since last reading x Charge per kWh = Total energy charge.
3. Total energy charge + Fixed monthly fees = Final bill.

To convert imperial meter readings to kWh, all you need to do is: Take a meter reading, and then subtract the new meter reading from the previous reading to work out the volume of gas used. Convert from imperial to metric by multiplying the units by 2.83.

How to convert Units to Kilowatt Hours?

1. Check your bill to find the number of Units used. 100. (Sample)
2. *Multiply by 2.83. (convert from imperial to metric) 283.
3. Multiply by 1.022640. (volume conversion factor) 289.407.
4. Multiply by 39.3. (calorific value) 11373.699.
5. Divide by 3.6. (kWh conversion factor) 3159.361. kWh.

Electricity meters measure in kilowatt hours (kWh) and often have an analogue or digital display, which are straight-forward to read. Read the first five numbers, and ignore any red numbers.

Calculating Kilowatt Hour Rate The kilowatt-hour rate is the price of power supplied by your electric provider. To calculate your kilowatt-hour rate, divide your total power bill, minus any taxes, by your total power consumption.

The Kilowatt-Hour A kilowatt-hour measures the energy an appliance uses in kilowatts per hour. The difference between kWh and kW, and what you see on your bill, is that kW reflects the rate of electricity you use, and kWh indicates the amount of electricity you use.

One kilowatt-hour is equivalent to the energy of 1,000 joules used for 3,600 seconds or 3.6 million Joules. In equation form: 1 kWh = 3.6 million J. So if your building uses 5000 kWh each day, your building is consuming the same amount of energy that would be required to lift 18 billion cans of soda per day.

A kilowatt-hour, otherwise known as a kWh, is a way to measure how much energy you’re using. It’s not the number of kilowatts you’re using in an hour, even though that seems to make sense. A kWh equals the amount of energy you would use by keeping a 1,000 watt appliance running for one hour.

Here’s a breakdown of the biggest energy use categories in the typical home:

• Air conditioning and heating: 46 percent.
• Water heating: 14 percent.
• Appliances: 13 percent.
• Lighting: 9 percent.
• TV and Media Equipment: 4 percent.

Myth: Unplugging your devices saves power and improves safety. Fact: Safety, maybe. But it won’t save much money these days. As it turns out, there is some validity to their argument, but there have also been recent technological breakthroughs that poke a hole in their defense.