(i) with the help of a labelled diagram, describe briefly the underlying principle and working of a stepup transformer.
(ii) Write any two sources of energy loss in a transformer. (iii) A step-up transformed converts a low input voltage into a high output voltage. Does it violate law of conservation of energy ? Explain.

Explanation

### Step-by-Step Solution

#### (i) Underlying Principle and Working of a Step-Up Transformer

1. **Definition**: A step-up transformer is an electrical device that increases the voltage from the primary coil to the secondary coil while decreasing the current.

2. **Principle**: The working of a step-up transformer is based on the principle of **mutual induction**. This principle states that a change in current in one coil (primary) induces an electromotive force (EMF) in a neighboring coil (secondary).

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