-

 Why does resistance increase instead of decrease when the temperature is increased on the conductor?

Ans: We know that there are free electrons in conductors which are responsible for the flow of electric current. When we apply the external electric field these electrons are moving in between the remaining fixed electron of the conductor and electrons moving opposite to the direction of the outward applied electric current. When the temperature is low the electrons move a fixed path without disturbing but when the temperature increases remaining fixed electrons (which are settled in orbit) create a vibration at a high amount due to this free electrons have difficulty moving and they collide with fixed electrons.

                                 One also a relation between resistance and temperature

                                                     R= R0(1+αt)

Comments

Post a Comment

Thank you for visiting😊

Popular posts from this blog

Clipper Circuits

-
Image
  Clipper Circuits Electronic devices are very sensitive to voltage. If a large amplitude voltage is applied, it may permanently destroy the device. So, it is essential to protect the electronics devices. The protection of the electronic devices can be achieved by using the clipper circuits. A clipper is a device that removes either the positive half (top half) or negative half (bottom half), or both positive and negative halves of the input AC signal. In other words, a clipper is a device that limits the positive amplitude or negative amplitude or both positive and negative amplitudes of the input AC signal. In some cases, a clipper removes a small portion of the positive half cycle or negative half cycle or both positive and negative half cycles. In the below circuit diagram, the positive half cycles are removed by using the series positive clipper. The clipper circuit does not contain energy storage elements such as capacitor but contains both linear and no-linear...
Read more

Why don't birds get electrocuted sitting on power lines?

-
Image
    Why don't birds get electrocuted sitting on power lines?   Electricity flows through a conductor, such as a wire, by means of a flow of electrons. When a bird sits on a power  line, its body is not in contact with the ground, which means that there is no complete circuit for the electricity to flow  through. The bird's body is not a good conductor of electricity, so the electrons cannot flow through it. Instead, they  flow through the wire, bypassing the bird's body.  To understand this better, consider a simple circuit consisting of a battery, a wire, and a light bulb. When the wire  is connected to the positive and negative terminals of the battery, a current flows through the wire, and the light bulb  illuminates. If the wire is broken, the current cannot flow, and the light bulb will not turn on. Similarly, when a bird sits  on a power line, its body does not provide a path for the electricity to flow through, so the current pass...
Read more

Using MOSFET Body Diodes to Charge Battery in Inverters

-
Image
  Using MOSFET Body Diodes to Charge Battery in Inverters In this post we try to understand how the internal body diodes of MOSFETs could be exploited for enabling the charging of battery through the same transformer which is being used as the inverter transformer. In this article we will investigate a full bridge inverter concept and learn how the in-built diodes of its 4 MOSFETs could be applied for charging an attached battery. What is a Full Bridge or H-Bridge Inverter In few of my earlier posts we have discussed  full bridge inverter circuits  and regarding their working principle. As shown in the above image, basically, in a full-bridge inverter we have a set of 4 MOSFETs connected to the output load. The diagonally connected MOSFET pairs are alternately switched through an external  oscillator , causing the input DC from the battery to transform into an alternating current or AC for the load. The load is normally in the form of a  transformer , whose low ...
Read more