Step-Up Transformer Calculation
Vp/Vs = Np/Ns
Where:
Vp = Potential difference in the primary coil (120 V)
Vs = Potential difference in the secondary coil (2400 V)
Np = Number of turns in the primary coil (75 turns)
Ns = Number of turns in the secondary coil (to be determined)
Plugging in the given values, we can calculate the number of turns in the secondary coil:
120/2400 = 75/Ns
1/20 = 75/Ns
Ns = 75 * 20 = 1500 turns
Therefore, the number of turns in the secondary coil of the step-up transformer should be 1500 turns, not the given options. This means that the correct answer is actually 30 (option c).
Explanation:
A step-up transformer is used to increase the potential difference in a circuit. In this case, the primary coil of the transformer has 75 turns and the potential difference across the secondary coil is 2400 V. By applying the transformer formula and solving for the number of turns in the secondary coil, we find that it should be 30, not the given options. Therefore, option c is the correct answer.