Question

Define watt. Write down an equation linking watts, volts and amperes.

Answer 1

You can easily find the solution to this question by following this approach: Watt is the unit of power, it can be defined in multiple ways, and the question has been asked from the topic Current Electricity, so the correct answer must be within the same topic as well.

Complete step by step answer:
We will be following the same approach as shared in the hint section of the solution to the question.
Watt is the SI unit of power and it is a measure of rate of doing work. Power or watt can be defined in numerous ways depending on the nature of the work done, and thus, there are numerous types of powers being referred to usually. The question has asked us about watt in correlation to volts and amperes, i.e. this question needs us to define watt or power keeping the topic current electricity or electrostatics in mind.
We can define watt keeping electrical appliances in mind as:
When an electrical appliance consumes electrical energy at the rate of $1$ joule per second, its power is said to be $1$ watt. Mathematically, we can write it as:
$1$ watt = $1$ volt x $1$ ampere.
The equation otherwise is:
$P = VI$
Where, $P$ is the power, in unit Watt
$V$ Is voltage with unit as volt and,
$I$ is the current with unit as ampere

Note: This question is a bit different than other questions asking you to define something, instead of asking you to define power, the question picked to ask you to define watt, always keep in mind that SI units’ definitions are not always the same as the quantity’s definitions, as we can see in the solution given above. Many students make mistakes here and simply define power here, which is a completely wrong solution.