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## What happens when an alternating current passes through the primary coil?

When an AC signal is applied to the primary coil, the changing current causes a magnetic field to change (get bigger or smaller). Current comes in with a voltage . The current passes through the windings creating magnetic flux in the iron core. This flux is traveling through loops of wire on the other circuit.

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## How does the alternating current flowing through the primary coil of the transformer creates an alternating current in the secondary coil?

The alternating current creates an alternating magnetic field across the transformer. A magnetic field develops in the iron core of the transformer. This causes a potential difference to be induced across the secondary coil.

## How does the current in the primary coil of a transformer induce a potential difference in the secondary coil?

The coils are not electrically connected. the primary coil current produces a magnetic field, which changes as the current changes. the iron core increases the strength of the magnetic field. the changing magnetic field induces a changing potential difference in the secondary coil.

## When there is an alternating current in the primary coil what is produced in Part B?

magnetic field
Part B is the core made of (laminated soft) iron. (iii) When there is an alternating current in the primary coil, what is produced in part B? A magnetic field which is changing / alternating is produced in part B.

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## What is the formula for efficiency of a transformer?

Just like any other electrical machine, efficiency of a transformer can be defined as the output power divided by the input power. That is efficiency = output / input . Transformers are the most highly efficient electrical devices. Most of the transformers have full load efficiency between 95% to 98.5% .

## Which is the potential difference in a step up transformer?

the potential difference in the secondary (output) coil is in volts (V) In a step-up transformer, the potential difference in the secondary coil is greater than the potential difference in the primary coil. In a step-down transformer, the potential difference in the primary coil is greater than the potential difference in the secondary coil.

## Which is greater the potential difference between primary and secondary coils?

In a step-down transformer, the potential difference in the primary coil is greater than the potential difference in the secondary coil. A mains transformer (230 V) has 11,500 turns on its primary coil and 600 turns on its secondary coil. Calculate the potential difference obtained from the secondary coil.