Question
Question: What is the power produced by an appliance marked "240 V, 2 A"? A. 8.3 mW B. 60 W C. 120 W D...
What is the power produced by an appliance marked "240 V, 2 A"?
A. 8.3 mW
B. 60 W
C. 120 W
D. 480 W
Solution
Electric power is the rate at which electrical energy is transmitted by an electric circuit per unit of time. The watt, or one joule per second, is the SI unit of power. Electric generators are the most common source of electricity, however other sources such as electric batteries can also be used. The electric power sector often provides it to companies and residences (as residential mains electricity) via an electric power grid.
Formula used:
P = VI
V = Potential Difference
I = Current
Complete step by step solution:
Through a grid link, the electric power sector produces and distributes power in adequate amounts to regions that require it. The grid is responsible for distributing electricity to consumers. Electricity is generated in two ways: central power plants and distributed production. The electric power business has been steadily deregulating, with new firms providing consumers with alternatives to the old public utility providers.
Electric power, like mechanical power, is the rate at which work is completed, measured in watts and symbolised by the letter P. Wattage is a slang word that means "electric power in watts." An electric current I carrying a charge of Q coulombs per t seconds flowing through an electric potential (voltage) differential of V produces an electric power in watts.
P=work done per unit time=tW=QWtQ=VI
Now given
V=240 V
I=2A
⇒P = V × I = 240 × 2 = 480 W
Note: Note that unit of P is W
Electric power is widely employed in industrial, commercial, and consumer applications because it is generated at central generating stations and delivered through an electrical transmission grid. A country's per capita electric power consumption is linked to its industrial growth. Electric motors are used to propel subways and railway trains, as well as to power manufacturing machines.