5- 10 kVA, 250/500V, SOHZ single phase transformer, the flux density is 1.IWb/m ant the voltage per turn in the primary is 2V then the voltage per turn on the secondary is ----- a) 4V b) 2V c) 6.1V d) none of the previous 6- A transformer has 200 W as an iron loss at full load. The iron loss at half-load will be (a) 50W b) 100W c) 400W d) none of the previous.

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KVL and KCL

KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.

Sign Convention

Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.