Students read descriptions of the voltage, current, and turns ratios of the primary and secondary coils for a transformer in this interactive lesson.

In this animated activity, learners see that changing the resistance value of the load in the secondary of a transformer causes current to vary in the primary.

Learners read an analogy comparing an electrical transformer to mechanical gears.

Students read an introduction to transformers that includes schematic symbols, turns ratios, mutual inductance, and the coefficient of coupling.

In this animated object, learners study the operation of a linear voltage differential transformer. A brief quiz completes the activity.

Students follow the steps that are required to select a transformer with the proper ratings. Voltage, frequency, current, and KVA are considered.

In this interactive object, learners follow steps to find phase voltages in a partial three-phase power distribution circuit.

Learners view the waveforms and voltages of an Edison Three-Wire System and read a description of the polarities across the secondary of the center-tap transformer. This transformer supplies power to residential homes.

Using a memory shortcut for calculations, the learner determines line and phase values of current in a three-phase AC configuration. Practice problems complete the activity.

Learners consider why an impedance matching transformer is needed to connect an antenna to a television.

Learners read a description of the wiring configuration of a residential Edison Wire System, which consists of a transformer secondary circuit. The circuit supplies two 115-volt sources and one 230-volt source.

Learners examine the impedance matching capability of a transformer and how to select the proper turns ratio to achieve this function. A brief quiz completes the activity.

Learners read an explanation of how the Magnetron Ignition System uses a solid state switching component, a step-up transformer, and magnetism to provide a high voltage spark in a one-cylinder combustion engine.

Learners examine an electric motor control circuit that uses a motor starter module. This activity has audio content.

The learner will understand the operation of motor control circuits used to start and stop three-phase motors.

Students read an explanation of reactive power in a power distribution system involving motors, generators and transformers. A brief quiz completes the activity.

Learners read an explanation of the concept of apparent power in a power distribution system involving motors, generators, and transformers. A quiz completes this interactive lesson.