Mini Physics Alternating current is suitable for both heating and lighting because the heating effect of a current is independent of its direction. However, in many practical systems, the use of alternating current will not be possible. For example, in large motors and electric railway systems, we will need the operating current to flow in one direction consistently and alternating current is …
The transformer’s ability to step a.c. voltage up or down with ease gives a.c. an advantage unmatched by d.c. in the realm of power distribution. When transmitting electrical power over long distances, it is far more efficient to do so with stepped-up voltage and stepped-down currents, then step the voltage back down and the current back up for industry, business, …
Although transformers are very efficient devices, small energy losses do occur in them due to four main causes: Resistance of windings – the low resistance copper wire used for the windings still has resistance and thereby contribute to heat loss Flux leakage – the flux produced by the primary coil may not be all linked to the secondary coil if …
Summary: When an alternating voltage Vp is applied to the primary coil, an a.c. current flows in the primary coil. This a.c. current sets up a changing magnetic field in the iron core. The flux through the primary coil is linked to the flux in the secondary coil through the iron core. This alternating magnetic field induces an e.m.f. in …
A transformer is a device by which the voltage of an input alternating supply may be changed. The frequency of the supply, however, remains unchanged. Physical Features: 2 coils of wire (not connected to each other) known as the primary and secondary windings, are electrically insulated from each other and wound on a laminated soft iron core. The number …
Now, most of the people must be familiar with the single pendulum as shown in the video below. You can predict its movement accurately using simple equations. A single pendulum: https://www.youtube.com/watch?v=4JSScMj-4iA Now, what if i add another pendulum to the existing one? Will the movements be as predictable as the single pendulum? Or will it go “all over the place”? …
This post contains all the important formulas that you need for A Level Physics. (Equivalent to AP Physics) If you do not recognise any of the terms listed here, you should go review the respective topic. Please drop me a comment if I missed out any particular important definitions. Measurement:Random errors are errors of measurements in which the measured quantities …