Physics – 4.5.6 The transformer | e-Consult
4.5.6 The transformer (1 questions)
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The voltage ratio of a transformer is directly proportional to the ratio of the number of turns in the primary and secondary coils. The formula for the voltage ratio (Vp/Vs) is:
Vp/Vs = Np/Ns
Where:
- Vp = Voltage in the primary coil
- Vs = Voltage in the secondary coil
- Np = Number of turns in the primary coil (100)
- Ns = Number of turns in the secondary coil (500)
Therefore, Vp/Vs = 100/500 = 1/5 = 0.2
This means that the secondary voltage is 1/5th of the primary voltage. Specifically, the output voltage (Vs) is 0.2 times the input voltage (Vp). Since the secondary coil has more turns than the primary coil, the transformer is a step-up transformer. This indicates that the input voltage is lower than the output voltage. The transformer increases the voltage from the primary to the secondary side.