Lesson: Transformation of Current and VoltagePhysics
In this lesson, we will learn how to calculate the current and voltage changes due to electromagnetic induction using a step-up or step-down transformer.
Sample Question Videos
A 100% efficient transformer is used to step down 110 V from a wall socket to 9.0 V for a radio.
If the primary winding has 500 turns, how many turns does the secondary winding have?
If the radio operates at a current of 500 mA, what is the current through the primary winding?
A step-up transformer connected to a 110 V line is used to supply a hydrogen gas discharge tube with 5.0 kV (rms). The tube dissipates 75 W of power.
What is the ratio of the number of turns in the secondary winding to the number of turns in the primary winding?
What is the rms current in the primary winding?
What is the rms current in the secondary winding?
What is the effective resistance seen by the 110 V source?