IMPULSE MOMENT METHOD
When an object has a momentum , and a force is applied for an amount of time, the momentum can change to a new value . The impulse-momentum theorem states that the impulse is equal to this change in momentum. ... The unit of impulse is the Newton-second
Kavya Krishna
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DC AND AC MACHINES
A.C. motors are powered from alternating current (A.C.) while D.C. motors are powered from direct current (D.C.), such as batteries, D.C. power supplies or an AC-to-DC power converter. ... A.C. induction motors do not use brushes; they are very rugged and have long life expectancies