|
Experiment E13 Investigating a Transformer |
||||||||||||||||||||||||||
| Objectives | ||||||||||||||||||||||||||
|
||||||||||||||||||||||||||
| Description | ||||||||||||||||||||||||||
| In this activity, you will investigate how turn ratio determines the voltage ratio and current ratio of a transformer. You will also study the transformer with and without soft iron core. By using a pair of light bulbs, you will appreciate the power transmission using transformers.
In Experiment 1, you will set up a transformer in which the secondary coil is made by wrapping some turns round the soft-iron core of an induction coil. The reason for doing this is that you can change the number of turns easily. You will study how the secondary voltage depends on the turn ratio.
In Experiment 2, you will study the transformer with and without closed physical contact between the two C-cores. In the first part of the experiment, the two C-cores are placed in closed contact. In the second part, the two C-cores would be separated by a pair of thick paper.
In Experiment 3, you will study the current ratio in a transformer. You will vary the secondary current to see how the primary current changes. In Experiment 4, you will simulate the power loss by a pair of 8 W resistors. In Circuit A, transformers are not used. Bulb P is more close to the power supply than S. You will compare their illuminations. In Circuit B, transformers are used. Here, you will see the advantage. Circuit C is to investigate the current in the cable between the transformers using a third light bulb. |
||||||||||||||||||||||||||
| Apparatus | ||||||||||||||||||||||||||
|
