The transformer turns ratio is the ratio of the number of turns in the primary coil to the number of turns in the secondary coil. This ratio determines how voltage is transformed from the primary to the secondary winding. Formula for Turns Ratio The turns ratio (TR) of a transformer is given by: Where:
Moving the connection by two tap locations changes the number of turns in the primary coil by about 80 turns. The primary is changed from 1620 turns to 1540 turns. The turns ratio is changed so that the transformer can compensate for the low voltage and ensure that the secondary is at the rated voltage.
Example 2: Finding Secondary Voltage Using Turns Ratio A transformer has: Using: Vs = 120 / 3 = 40V So, the secondary voltage is 40V. Example 3: Finding Secondary Turns Given Voltage Ratio A transformer has: Using: Ns = (900 × 80) / 240 = 300 So, the secondary winding has 300 turns.
The inductance is proportional to the number of turns squared, and a small 120/240V 50/60Hz mains transformer primary might be some hundreds of turns, so you can see how far off a single turn is. At a fraction of a volt, or higher frequencies at relatively low voltage, a single-turn primary might make some sense.
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A step-down transformer changes the potential difference of an alternating current from 10000 V to 250 V. If it has 25 turns on its secondary coil, how many turns does it have on its primary coil?
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How many turns does a transformer turn? Moving the connection by two tap locations changes the number of turns in the primary coil by about 80 turns. The primary is changed from 1620 …
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As an approximation *only*, the turns ratio is approximately equal to the voltage ratio. 230 / 18 = 12.78, so an initial estimate would be a 12 or 12.5:1 turns ratio. The ratio will …
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