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- When the current in one coi1 changes at a rate of 5.6 A/s an emf of 6.3 × 10-3 is induced in a second, nearby coil. What is the mutual inductance of the two coils?Will a transformer work if the input is a dc voltage?Check Your Understanding A transformer steps the line voltage down from 110 to 9.0 V so that a current of 0.50 A can be delivered to a doorbell (a) What is the ratio of the number of turns in the primary and secondary windings? (b) What is the current in the primary winding? (c) What is the resistance seen by the 110-V source?
- Does the induced emf always act to decrease the magnetic flux through a circuit?How can you distinguish the primary winding from the secondary winding in a step-up transformer?A step-up transformer is designed so that the output of its secondary winding is 2000 V(rms) when the primary winding is connected to a 110-V (rms) line voltage, (a) If there are 100 turns in the primary winding, how many turns are there in the secondary winding? (b) If a resistor connected across the secondary winding draws an rms current of 0.75 A. what is the current in die primary winding?
- The ratio of transformation is 50. If 220V AC is supplied to its primary coil, voltage in secondary coil will beA step down transformer produces produces a voltage of 6 volts across the sec- ondary coil when the voltage across the primary coil is 120 V. If we now drove this circuit in the reverse direction, what voltage appears across the original primary coil when 120 V is applied to the original sec- ondary coil?The secondary coil of a transformerhas 440 turns, and produces anoutput AC voltage of 25.0 V whenan input voltage of 9.00 V isapplied to the primary. How manyturns does the primary coil have?