Transformers Worksheet

# Transformers Worksheet - considered an isolation...

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Transformers Name:___________________ Transformers are used to increase, decrease or isolate AC voltages and currents in circuits. The operation of transformers is based on the principal of mutual inductance. A transformer usually consists of two coils of wire wound on the same core. The primary coil is the input coil of the transformer and the secondary coil is the output coil. Varying the magnetic flux in the primary coil (via an input or primary voltage) generates the same variation in magnetic flux in the secondary coil, thus inducing an output (or secondary) voltage in the secondary coil. As the number of windings of the coils change, the output/input voltage ratio varies directly in proportion to the output/input ratio of the coil windings. For an ideal transformer, output power equals the input power (I s V s =I p V p ). If the output voltage is greater than the input voltage, it is called a step-up transformer. If the output voltage is less than the input voltage it is called a step-down transformer. If they are the same, it is
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Unformatted text preview: considered an isolation transformer. Complete the chart below (The input always has 600 windings, the output current is always 2A): Input voltage Output voltage Step-up, Step Down, or isolation? Number of output coil windings Output Power (W) Input Current (A) 12 V 12 v 12 V 240 V 12 V 1 V 120 V 360 V 120 V 24 V 120 V 6 kV Summary Questions: 1. What is the relationship between the number of input and output windings when a transformer is operating as a step-up transformer? Step-down transformer? Isolation transformer? 2. What is the type of the input voltage (AC or DC) needed for the electrical transformer to function properly? Why? 3. What is the function of the iron core the windings are wound around? 4. Why is high voltage used to send electrical energy over large distance in transmission wires? 5. Nature does not provide a greater or smaller voltage without a loss/gain of some other quantity in order to conserve energy. What other electrical quantity is changed to conserve energy?...
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