Question 432: AC fundamentals

Question

A step-up transformer has 300 turns of primary winding and 450 turns of secondary winding. A primary is connected to 150 V and the current flowing through it is 9A. The current and voltage in the secondary are

Accepted Answer

Given that, number of turns in primary winding, $$N_p=300$$
Number of turns in secondary winding, $$N_S=450$$
Primary voltage, $$V_P=150 \mathrm{~V}$$
Primary current, $$I_P=9 \mathrm{~A}$$
For step-up transformer,
$$\begin{aligned}
& \frac{V_S}{V_P}=\frac{N_S}{N_P} \
& \frac{V_S}{150}=\frac{450}{300} \
& \Rightarrow \quad V_S=\frac{450}{300} 	imes 150 \
& \Rightarrow \quad V_S=225 \mathrm{~V}
\end{aligned}$$
Again, $$V_P I_P=V_S I_S$$
$$\begin{aligned}
150 	imes 9 & =225 	imes I_S \
I_S & =\frac{1350}{225}=6.0 \mathrm{~A}
\end{aligned}$$

Answer

$$13.5 \mathrm{~A}, 100 \mathrm{~V}$$

Answer

$$13.5 \mathrm{~A}, 225 \mathrm{~V}$$

Answer

$$4.5 \mathrm{~A}, 100 \mathrm{~V}$$

Answer

$$6.0 \mathrm{~A}, 225 \mathrm{~V}$$

AC fundamentals

A step-up transformer has 300 turns of primary winding and 450 turns of secondary winding. A primary is connected to 150 V and the current flowing through it is 9A. The current and voltage in the secondary are

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