Which of the following instruments can be used to measure current in an a.c circuit?
Hot wire ammeter
Moving coil ammeter
Tangent galvanometer
Moving coil galvanometer
Explanation
Video Explanation
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The instruments that can be used to measure current in an AC circuit include:
1. **Hot wire ammeter**: This device can measure both AC and DC currents. It operates on the principle that the length of a wire increases due to the heat produced by the current flowing through it.
2. **Moving coil ammeter**: This device is generally used to measure DC current. It operates on the principle of magnetic deflection, where a coil carrying current is placed in a magnetic field, causing the coil to deflect. The deflection is proportional to the current. However, it's not suitable for AC measurements because the direction of current changes in AC and the needle would vibrate about zero.
3. **Tangent galvanometer**: This device is used to measure direct current (DC) only. It works on the principle of the tangent law of magnetism, which states that the tangent of the angle a compass needle makes is proportional to the ratio of the magnitudes of the two perpendicular magnetic fields.
4. **Moving coil galvanometer**: Like the moving coil ammeter, this device is also used to measure DC current. It works on the principle of a coil placed in a uniform magnetic field gets deflected when current is passed through it.
So, out of the options you provided, the **Hot wire ammeter** is suitable for measuring current in an AC circuit.
My school stop misbehaving ur explanation video says hot wire and ur answer is D (moving coil) its seems like you people are now moving without direction.
Moving coil galvanometer cannot measure ac current because ac current varies in distance
Moving coil galvanometer is a device used for measuring the. current in a circuit. The Principle of moving coil galvanometer is, that a current carrying coil placed in a magnetic field experiences a torque. It consists of a rectangular coil of a large number of turns of thin.
why is the explanation video answer quite different from the answer written na. you guys should be uniform na
A moving coil galvanometer cannot measure a.c current; but a moving coil galvanometer to which a rectifier has been attached can measure a.c. This is because the rectifier converts a.c to d.c.
So the correct answer is A.
The answer to the question is different to the explanation video
Pls put me through it
