Primary and Secondary Coils
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-398
2025-12-13
16
Primary and Secondary Coils. Demonstrations. -Select a coil of large wire, called a primary coil, of such a size that it will easily go inside. the secondary, and connect it with a battery.
Thrust it into the secondary coil as you did the bar magnet in the last demonstration, and the same results will be obtained. Why?
Place the primary coil inside the secondary and introduce a switch between the primary and the battery. Make the circuit and notice the deflection. Break the circuit and again notice the deflection. Compare the directions of these deflections with those obtained in the above demonstration by moving the primary.
Vary the demonstration by introducing a resistance box between the primary coil and its battery, instead of the switch. When a steady current is allowed to pass, there will be no deflection of the galvanometer. If the amount of current in the primary is changed, however, either increased or diminished, the throw of the needle will show the existence of an induced current.
Experiment has shown that the following laws hold true for induced currents:
- Whenever the current in the primary coil is either made or increased, there is induced in the secondary a current in the opposite direction.
- II. Whenever the current in the primary coil is either broken or diminished, there is induced in the secondary a current in the same direction.
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