Core of a transformer is made up of:
- soft iron
- steel
- iron
- alnico
The Correct Option is A
Solution and Explanation
Top Questions on Alternating current
- An alternating current at any instant is given by \[ i = \left[ 6 + \sqrt{56} \sin\left(100 \pi t + \frac{\pi}{3}\right) \right] \, \text{A}.\] The RMS value of the current is ______ A.
- JEE Main - 2024
- Physics
- Alternating current
- In an ac circuit, the instantaneous current is zero,when the instantaneous voltage is maximum. In this case, the source may be connected to :
A. pure inductor.
B. pure capacitor.
C. pure resistor.
D. combination of an inductor and capacitor.
Choose the correct answer from the options given below :- JEE Main - 2024
- Physics
- Alternating current
- An alternating emf \( E = 110\sqrt{2} \sin 100t \, \text{volt} \) is applied to a capacitor of \( 2\mu\text{F} \), the rms value of current in the circuit is \(\dots\) \(\text{mA}\).
- JEE Main - 2024
- Physics
- Alternating current
- A coil of negligible resistance is connected in series with \(90 \, \Omega\) resistor across \(120 \, \text{V}, \, 60 \, \text{Hz}\) supply. A voltmeter reads \(36 \, \text{V}\) across resistance. Inductance of the coil is:
- JEE Main - 2024
- Physics
- Alternating current
- When a coil is connected across a 20 V dc supply, it draws a current of 5 A. When it is connected across 20 V, 50 Hz ac supply, it draws a current of 4 A. The self inductance of the coil is ______ mH.
(Take \(\pi\) = 3)- JEE Main - 2024
- Physics
- Alternating current
Questions Asked in AFMC exam
- 1200 ml of air remaining in lungs even after forceful expiration is
- AFMC - 2012
- Exchange Of Gases
- A dicot plant in which scattered vascular bundles are present in stem is
- AFMC - 2012
- Anatomy of Flowering Plants
- Which plays an important role in the dispersal of spores in Funaria?
- AFMC - 2012
- Kingdom Plant
- Sexual reproduction in eubacteria takes place by
- AFMC - 2012
- Kingdom Monera
- Which of the following acid is also a vitamin?
- AFMC - 2012
- Digestion and absorption
Concepts Used:
Alternating Current
An alternating current can be defined as a current that changes its magnitude and polarity at regular intervals of time. It can also be defined as an electrical current that repeatedly changes or reverses its direction opposite to that of Direct Current or DC which always flows in a single direction as shown below.
Alternating Current Production
Alternating current can be produced or generated by using devices that are known as alternators. However, alternating current can also be produced by different methods where many circuits are used. One of the most common or simple ways of generating AC is by using a basic single coil AC generator which consists of two-pole magnets and a single loop of wire having a rectangular shape.
Application of Alternating Current
AC is the form of current that are mostly used in different appliances. Some of the examples of alternating current include audio signal, radio signal, etc. An alternating current has a wide advantage over DC as AC is able to transmit power over large distances without great loss of energy.