Question

Who will spend more electrical energy? \[500{\text{ }}watts\]TV set in \[30\]mins, or \[600{\text{ }}watts\] heater in \[20\]mins?

Answer 1

Hint: Energy consumption can be calculated by finding out how much power is applied over a known period.
Here, the electrical energy before it is delivered to the end-user, all electrical energy is potential energy
Electrical energy is usually referred to by the kilowatt-hour. hence it is the product of the power in kilowatts multiplied by running time in hours


Complete step by step solution:
Generally, Watts is a measure of power. To find the power in an Electrical system we have to multiply the Voltage with the Amps that the system uses.
Now consider a DC circuit the applied voltage of the circuit is \[12v\] and the current drawn is \[5A\] then the power supplied is found by, \[12 \times 5{\text{ }} = {\text{ }}60{\text{ }}Watts.\]
If we consider electrical energy then the TV which has a rating of \[500{\text{ }}watts\] been powered for \[30\]minutes will consume more energy than the electric heater that has a rating of \[600{\text{ }}watts\] for \[20\]minutes.
The energy calculating formula is given by,
\[E = Pt\]
Where,
\[E\] refers to the energy in joules.
\[P\] refers the power in watts and
\[T\] refers the time in seconds
The overall consumed energy by TV set is,
\[500W \times 30minutes = 15000Watt - minutes\]
The overall consumed energy by Heater is,
\[600W{\text{ }} \times 20minutes = 12000Watt - minutes\].
\[15000 > 12000\]
Hence, TV sets consume more energy.

Note:
Electrical energy is energy described as a movement of electrons.
Electrical energy is denoted by the energy that has been converted from electric potential energy.
This energy is described as the combination of electric current and electric potential which is delivered by an electrical circuit.