🔋college physics i – introduction review

key term - Step-up transformer

Definition

A step-up transformer increases the voltage from the primary coil to the secondary coil while decreasing the current proportionally. This is achieved using a higher number of turns in the secondary coil compared to the primary coil.

5 Must Know Facts For Your Next Test

  1. Step-up transformers are used to increase voltage levels, which makes them essential for efficient long-distance power transmission.
  2. The voltage increase is directly proportional to the ratio of turns between the secondary and primary coils: $V_s / V_p = N_s / N_p$.
  3. The power in an ideal transformer remains constant, so if voltage increases, current decreases: $P = IV$.
  4. Core losses (hysteresis and eddy currents) are factors that affect real-world transformer efficiency.
  5. Applications include electrical substations, x-ray machines, and various electronic devices requiring high voltages.

Review Questions

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