2. A 15 kVA single phase transformer is being evaluated for efficiency. The transformer is connected to an input voltage of $E_p = 1500$ V. It is known that for an ideal transformer ($\eta = 100\%$), $E_s = 6000$ V and $I_s = 2.5$ A. During the evaluation, the input voltage and output power are held constant.
Determine:
a. Input current, $I_p$, if the efficiency is decreasing 10 times, start from 100% with a 10% decrement. (Fill the Table 2.1)
[30 points]
b. In Table 2.1, plot the relationship between input current, $I_p$, and transformer efficiency, $\eta$. [20 points]
Table 2.1 Efficiency dan input current
No
Efficiency, $\eta$ (%)
Input Current, $I_p$ (A)
1
100
2
90
3
80
10
