| TO DETERMINE: SINGLE-PHASE DIRECT CURRENT | Kilowatts I x E x PF 1000 I x E 1000 | Horsepower I x E x %EFF x PF 746 I x E x %EFF 746 | Amperes (when HP is known) HP x 746 E x %EFF x PF HP x 746 E x %EFF | Amperes (when kW is known) KW x 1000 E x PF KW x 1000 E |
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What is power formula?
P = E/t
: This formula is also called the mechanical power equation. Here E stands for energy in joule and t stands for time in seconds. This formula states that the consumption of energy per unit of time is called power.
How do you calculate power consumption?
- Daily Power Consumption. Daily Power Consumption = Wattage rating x time in hours. 2000 Watts x 3 Hrs = 6000 Watts-Hour. …
- Monthly Power Consumption. Monthly Power Consumption = Wattage rating x time in hours. 2000 Watts x 3 Hrs x 30 days = 180000 Watts-Hour. …
- Annual Power Consumption.
What is current formula?
The current is the ratio of the potential difference and the resistance. It is represented as (I). The current formula is given as
I = V/R
. The SI unit of current is Ampere (Amp).
How many kW is a kWh?
1 kWh equals one hour of electricity usage at a rate of 1 kW
, and thus the 2 kW appliance would consume 2 kWh in one hour, or 1 kWh in half an hour. The equation is simply kW x time = kWh.
What are the three formula of power?
| Current (single phase): I = P / V p ×cos φ Current (3 phases): I = P / √3 V l ×cos φ or I = P / 3 V p ×cos φ | Power (single phase): P = V p ×I p ×cos φ Power (3 phases): P = √3 V l ×I l ×cos φ or P = √3 V p ×I p ×cos φ |
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What are the 3 equations for power?
P = ΔV
2
/ R
We now have three equations for electrical power, with two derived from the first using the Ohm’s law equation. These equations are often used in problems involving the computation of power from known values of electric potential difference (ΔV), current (I), and resistance (R).
How do you calculate work?
The formula for work is ,
work equals force times distance
. In this case, there is only one force acting upon the object: the force due to gravity. Plug in our given information for the distance to solve for the work done by gravity.
What are types of current?
There are two kinds of current electricity:
direct current (DC) and alternating current (AC)
. With direct current, electrons move in one direction. Batteries produce direct current. In alternating current, electrons flow in both directions.
How do you calculate current bill?
| Electrical Appliance Power Wattage in Watts “W” | Clothes Iron 1400 | Dishwasher 1300 | Electric Kettle 1700 |
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How do you calculate total current?
What is the formula for a total current? IT
= VT/RT
or I total = V total / R total or the total current = the total voltage / the total resistance.
Is 50 kWh a day a lot?
But since most homes are comparable enough in size and we can’t control the weather, 50 kWh per day is a
good
number to use, though maybe a bit on the high end for some homes.
What is kWh formula?
The “kilowatt-hours” you see on your power bill expresses the amount of power that you consumed in a month. To calculate the kWh for a specific appliance,
multiply the power rating (watts) of the appliance by the amount of time (hrs) you use the appliance and divide by 1000.
How many kWh is 30kw?
| Power in kW Time in hours Energy in kWh | 1 kW 20 Hrs 20 kWh | 1 kW 25 Hrs 25 kWh | 1 kW 30 Hrs 30 kWh | 1 kW 35 Hrs 35 kWh |
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What is the formula for efficiency?
Efficiency is often measured as the ratio of useful output to total input, which can be expressed with the mathematical formula
r=P/C
, where P is the amount of useful output (“product”) produced per the amount C (“cost”) of resources consumed.
How do you find power?
Power is equal to work divided by time
. In this example, P = 9000 J /60 s = 150 W .
