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Multiple Choice

In a typical ____ transformer, there are more turns in the primary coil than in the secondary coil.

The main idea is that the voltage change in a transformer comes from the turns ratio of its windings. In a typical step-down transformer, the primary winding has more turns than the secondary winding. Since Vp/Vs = Np/Ns, a larger number of turns on the primary means the secondary voltage is lower than the primary voltage. Energy balance (ignoring losses) also tells us that Is is greater than Ip, so the current on the load side increases as the voltage decreases. This is exactly how a step-down transformer lowers high voltages to safer, usable levels for equipment and devices. If the secondary had more turns, you’d get a step-up; if the turns were about the same, you’d have an isolation transformer providing voltage isolation with similar voltage levels; an autotransformer uses a single winding with taps rather than separate primary and secondary windings.

The main idea is that the voltage change in a transformer comes from the turns ratio of its windings. In a typical step-down transformer, the primary winding has more turns than the secondary winding. Since Vp/Vs = Np/Ns, a larger number of turns on the primary means the secondary voltage is lower than the primary voltage. Energy balance (ignoring losses) also tells us that Is is greater than Ip, so the current on the load side increases as the voltage decreases. This is exactly how a step-down transformer lowers high voltages to safer, usable levels for equipment and devices. If the secondary had more turns, you’d get a step-up; if the turns were about the same, you’d have an isolation transformer providing voltage isolation with similar voltage levels; an autotransformer uses a single winding with taps rather than separate primary and secondary windings.