Generate Quiz 69A71A9416685

The induced electromagnetic field (emf) in a coil is determined by the number of turns and the rate at which the flux changes between the coils, as per Faraday’s laws of electromagnetic induction. The induced emf in the coil increases with the rate of change of current.

Kinetic or mechanical energy can be transformed into electrical energy by a generator. It has the ability to generate both AC and DC current. An alternating current that alternates between directions is produced by an AC generator. However, a direct current only flows in one direction in a DC generator.

The propensity of a coil to resist changes in current within itself is known as self-inductance. The L Formula for Self Inductance = Flux / Current serves as its representation.
Here we are now,

Since L = flux / I, flux flowing through equals LI.

When currents flow in opposite directions through two parallel wires, the magnetic fields created by those currents will point in the same direction (use the right-hand grip rule). Wires would therefore repel one another.

Henries per meter (H/m) or newtons per ampere squared (N⋅A^−2) are the SI units for magnetic permeability.

Turns (secondary)/V(secondary) = Turns(primary)/V(primary)

X turns / 3000 V is equal to 400 turns / 120 V.

X = 3000 * 400 / 120 = 10,000 turns

In the late 1800s, British physicist John Ambrose Fleming developed the right-hand thumb rule for use in electromagnetism.

Given:

Emf(E) = 400

∆I=10-0

∆t=0.5s

Locate:

L=?

The formula

E=L∆I/∆t

Answer:

400 = L× (10-0/0.5)

L×20 = 400

L = 20

The right response is A since the motional EMF formula is length x speed x magnetic field flux.

l. Ns < N p in a step-down transformer

A step-down transformer raises current while lowering voltage.