Question

Name the S.I. unit of electrical energy.
\[\begin{array}{*{35}{l}}
   \text{A}\text{. }kWh \\
   \text{B}\text{. }J.sec \\
   \text{C}\text{. }W \\
   \text{D}\text{. }kW/h \\
\end{array}\]

Answer 1

Hint: We know that the unit of energy is the joule, and we also know that the unit of power is the watt, and for the time the unit is second. If we know how much power an electric appliance intakes and how much time it is stitched on then we can calculate the number of joules that have been converted in this way we can find the electrical energy.

Complete step-by-step answer:
It is the energy developed due to electric potential energy or kinetic energy, this energy is nothing but a flow of tiny particles known as electrons and protons. These electrons are actually negatively charged particles, which is the primary cause of the potential drop, which produces electrical energy.
The SI unit of power is WATT.
Electrical energy is calculated in kWh[Kilo-Watt-hour], i.e., the amount of power consumed in one hour.
The correct answer is option (1) kWh.
Additional Information:
\[\begin{array}{*{35}{l}}
   1\text{ }W=1\text{ }J/s \\
   1\text{ }kW=1000\text{ }W \\
   1\text{ }MW=1000000\text{ }W \\
   1000\text{ }W=\text{ }1000\text{ }J/s \\
   1\text{ }W=\text{ }0.1\text{ }kW \\
\end{array}\]
Ohm’s law states that electric current through a conductor is directly proportional to voltage and inversely proportional to resistance.
A transformer is a device that is used to step up or step down voltage, it is done so that when current travels a long distance then no loss of electric current is there.
Resistance is a measure of the opposition of current flow, in an electrical circuit, it is generally measured in Ohm’s

Note: Learn all the types of units correctly students generally confuse between Watt and joule, electricity is measured in Joule while power is measured in Watt. Kilowatt-hour is the commercial presentation of power.