Power is often defined as the degree to which a task is performed. When this is done in relation to time and the electrical circuit, it is known as electric power. Similarly, electrical energy is defined as the rate at which electricity is transferred across the electrical circuit at each time point. Electric Power is versatile - it can be generated by generators in our homes and can be supplied with batteries used in devices. Electric Power in an electric circuit is the rate at which work is done or energy is transformed into an electrical circuit.
Electricity Unit of Electric Power
When you press or pull something at a certain level, you do a certain job, and are represented by Joule in physics. Strength is actually a measure when performing any task. Watt is a unit of Electric Power. It is the degree to which a task is performed or how quickly a task is performed. One Watt is one Joule of work done on an object per second. Watt is represented as W.
The voltage is an electromotive force or a potential difference between two points, indicating the amount of work required to move the charge between two points. The unit of Electric Power is Watt.
The energy consumed in an electrical circuit is called one Watt where one current ampere appears to flow in that electrical circuit. In this case, the potential difference of 1 volt is used throughout.
If you want to identify a large unit of Electric Power of electricity, you can use a kilowatt (equivalent to 1000 watts).
Also read -
Electric Power formula class 10 or Formula of power class 10
To calculate the power, the simplest equation is the work done is divided by time.
(1) P = W / t
W done work; time
However, the above is mainly used for mechanical power. In terms of electricity, another equation is used when calculating a function by the amount of the charge and the potential difference where the charge goes.
(2) W = qV
When q = total value used and V = voltage
When we substitute (1) in (2) we get
(3) P = qV / t
Additionally, we know that the current is charged per second passing through the region at any point in time.
(4) q = It
Where q = total value and I = current (ampere)
Now, when we substitute (4) in (3)
P = IV
Here, P power, V or voltage difference may be present in the circuit and I is Current.
Power can also be written as
P = V^2 / R or I^2R
When V is voltage, R is resistant, and I is current..
This can be achieved by applying Ohm's law, which states that Voltage is equal to current*resistance.
Watt, joule per second
Scalar or Vector
Power Strength Formula
As power consumption level, power can be directly calculated using
P = Et
E is energy (Joules)
t is time in seconds
P = VQt
Q charges (Coulombs)
V is the potential difference in volts
t time in seconds
Energy Problems and Answers
The power used by the metal for two minutes is 18 kJ, at a power of 250 volts. Calculate Electric Current.
Here, t = 120 seconds
Energy = 18 kJ = 18000 Joules
Power = 250 V
Electricity = P = W / t = 18000 Joule / 120 seconds = 150 Watt
Hence,here Electric current (I) = 150/250
= 0.60 Ampere