Tag: electric current and circuit

Answer is A.

The heat which is produced due to the flow of  current   within an electric wire, is expressed in Joules.
James Prescott Joule was an English physicist who studied the nature of heat and established its relationship to mechanical work. He therefore laid the foundation for the theory of conservation of energy, which later influenced the First Law of Thermodynamics. He also formulated the Joules laws which deal with the transfer of energy.

If an electric fan is switched on in a closed room, the air will be heated because due to motion of the fan, the speed of air molecules will increase. In fact, we feel cold due to evaporation of our sweat

Laws of heating were given by Joule.

By Joule's Law, heat produced

According to Joule's law,       $W = JQ$

During wiring in our houses , we use the traditional concept of using red color wire as live , black as neutral and green for earth. These color codes are used to distinguish between live, neutral and earth wires, which is a standard coding of color nowadays.

$15   A$ current rating is used for appliances with high power rating such as washing machines, geysers, air coolers etc.

When connected in parallel each bulb has maximum potential difference across it. So, bulb will show its maximum power.

During wiring in our houses , we use the traditional concept of using red color wire as live , black as neutral and green for earth.These color codes are used to distinguish between live, neutral and earth. which is a standard way of coding of colors for electric connections.

According to new convention, live wire of codded by brown colour, neutral wire is coded by light blue colour whereas earth wire is coded by green and yellow colour.