The Watt Formula: Definition, Unit, Symbol and Relationship with Amperes and Volts
The Watt Formula: Definition, Unit, Symbol and Relationship with Amperes and Volts – What is the watts formula and how to apply it?, On this occasion About the knowledge.co.id will discuss it and of course other things that also cover it. Let's look at the discussion together in the article below to better understand it.
The Watt Formula: Definition, Unit, Symbol and Relationship with Amperes and Volts
Watt is an electrical unit to express the amount of power (Power) from various electrical equipment. The Watt unit was invented by Scottish inventor James Watt. In general, we can find watt units in various electrical equipment that is commonly used at home, such as lights, irons, washing machines, water pumps, and so on.
To turn on electrical equipment, the Watt unit is used which states how much electrical power is needed. In addition, we can also find Watt units in other electrical equipment, such as 1000 Watt Generators, 500 Watt Stabilizers, and so on. So the Watt unit states how much electrical power can be borne by these various electrical devices.
Unit Watt or Power
Based on SI units, power is expressed in units of Joules / second or J/s = Watt (W). Another unit of power that is often used is Horse Power (hp), 1 hp = 746 Watts.
The use of the Watt unit in this unit is a form of respect for the scientist who invented the steam engine, namely James Watt. Thus in the calculation of the Power formula it will produce an energy rate in units of Joules/second.
In Physics, Power is symbolized by the following equation:
P=W/t
From the above equation, we can also change the power formula to:
P = (F.s) / t
P=F v
These results are obtained because the Work Formula (W) = Force (F) multiplied by Distance (s) divided by Time (t)
And the speed formula (v) = distance (s) divided by time (t)
Information
P = Power (the unit is J/s or Watts)
W = Work ( Unit is Joule [ J ] )
t = Time ( the unit is second [ s ] )
F = Force (Unit Newton [ N ] )
s = Distance (unit is Meters [ m ] )
v = Speed (the unit is Meters / Second [ m/s ] )
Power Emblem
Power is classified as a type of derived quantity obtained from basic quantities. And dimensions can only be obtained from units.
Required dimension symbol:
L ⇒ length, unit meters
M ⇒ mass, kilograms
T ⇒ time, units of seconds (seconds)
The formula for power is P = W / t
The unit of work (W) is kgm^2s^{-2}, while time (t) is second or s. So the unit of power ie
\frac{kgm^2s^{-2}}{s} \rightarrow \boxed{kgm^2s^{-3}} or Watts.
Thus, the dimensional symbol for power is \boxed{ML^2T^{-3}}
-
Power Dimension
Examples of standard quantities and standard units are:
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Length is meter (m), Dimension Length [L]
Mass unit is kilogram (kg), Dimension Mass [M]
The unit time is second/second (s), dimension Time [T]
The unit for electric current is amperes (A), dimension [I]
The units for temperature are kelvin (K), dimensions [θ]
The unit for amount of substance is mole (mol), Dimension [N]
Unit of light intensity candela (Cd), dimension [J]
In a quantity, we certainly know what dimensions are. Dimensions are how a derived quantity is composed of basic quantities, generally written in capital letters, and these dimensions do not depend on numerical values.
Power, the unit of power is watts
So:
P = work/time
= (kg)(m/s²)(m)/(s)
= [M] [W]² [T]⁻³
So the dimensions of the power are [M] [L]² [T]⁻³
So, if there is a question that says, Determine the dimensions of the power! You can write it like below.
Power, the unit is watts
P = work/time
= W/t
= F x s / t
= m x a x s / t
= (kg) (m/s²) (m) / (s)
= [M] [L] [T]⁻² [L] [T]⁻¹
= [M] [W]² [T]⁻³
So the dimension of power is [M] [L]² [T]⁻³
Based on the physics equation above, it can be concluded that the greater the work rate, the greater the power rate. Meanwhile, the longer the time, the lower the power rate.
How to Calculate Watt Ampere and Volt Units
-
amperes
The amount of electric current that flows in the electric device used uses Ampere units. We can also find Ampere units in various kinds of electrical equipment at home, such as MCBs, wall sockets, and others. The Ampere unit states how much maximum electric current can flow through the electric device.
220 Watt/1 Ampere electric iron, 450Watt/2Ampere washing machine, and so on are types of electrical equipment that use amperes. The Ampere unit here states the amount of current that flows when the electric device is turned on.
Voltage
The volt is an electrical unit to express the amount of voltage generated or needed from various power sources. We can find various kinds of electrical devices that use volt units in electrical appliances at home, such as 220Volt written lamps, 220Volt washing machines, and so on.
The amount of electric voltage needed to turn on various electrical devices is expressed in volts. In addition, we can find Volt Units in various power plants, such as 220Volt Generators, 3-phase 380 Volt/220Volt Generators, and so on. So the amount of electric voltage that can be generated from these various power plants is the Volt Unit.
Unit relationship between Watts, Amperes and Volts
Volt is a unit of electric voltage that was first produced from a power plant, be it PLN or Genset, without the generated electric voltage, it cannot produce units of watts or amperage. So it would be nice for us to know in advance the Volt unit.
The working principle of GGL generates an electric voltage from a power plant, the voltage that is generated before it is used called GGL (E), then when this voltage is applied to various electrical devices it is called Clamp Voltage (V). Then when the voltage is applied to an electric device, it will produce an electric current which is called the Ampere unit.
How much the value of resistance in an electric device affects the amount of electric current that flows from the power source to the electric device. This is commonly referred to as electric power in Watts.
How to Calculate Electrical Units
- The greater the Resistance value (Ohm) on an electrical device, the smaller the power (Watts) will be needed, and the smaller the electric current (Ampere) is generated, with a large voltage (Volts) still.
- The smaller the Resistance value (Ohm) on an electrical device, the greater the power (Watts) that will be needed, and the greater the electric current (Ampere) produced, with the greater the voltage (Volts) still.
- The greater the voltage (Volts) used, the smaller the electric current (Amperes) produced with the same power load (Watts).
- The smaller the voltage (Volts) used, the greater the electric current (Amperes) produced with the same power load (Watts).
We can prove the above statement in the following calculation examples:
Calculation Example:
An electric device has a resistance value of 100 Ohm, then flows an electric voltage of 220 Volts, then the electric current that flows is:
Ohm's Law: V= I x R
V: Mains voltage (Volts)
I: Electric current (Ampere)
R: Resistance (Ohms)
V = I x R
220Volts = I x 100ohms
I = 220Volts: 100ohms
I = 2.2 Amperes
Then, How many Amperes of electric current are generated if the Resistance value is enlarged to 200ohm?
V = I x R
220Volts = I x 200ohms
I = 220Volts: 200ohms
I = 1.1 Amperes
Conclusion: The greater the resistance value, the smaller the electric current that flows (fixed voltage), and vice versa. Then, how much electric power (Watts), if the electric voltage is 220Volt and the electric current is 2.2Ampere?
Power formula (Watts): P = V x I
Q: Power (Watts)
V: Mains voltage (Volts)
I: Electric current (Ampere)
P = V x I
P = 220Volt x 2.2Ampere
P = 484 Watts.
Then, how much electric power (Watts) if the value of the electric current is reduced to 1.1 Amperes?
P = V x I
P = 220Volt x 1.1Ampere
P = 242 Watts.
Conclusion: The greater the power (Watts), the greater the electric current generated (fixed voltage), and vice versa. So if you have a question about 220 volts, how many watts, you also have to pay attention to the amperage
Thus the review from About the knowledge.co.id about Watt formula, hopefully can add to your insight and knowledge. Thank you for visiting and don't forget to read other articles.
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