If I₀ = 10^-12 W/m², and I = 4

question 42

Multiple Choice

If I₀ = 10^-12 W/m², and I = 4.5 x 10^-8 W/m², what is log (I/I₀) ?

• A)4.5 x 10⁴
• B)18
• C)11
• D)4.7
• E)3.7

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Definitions:

Motors

Devices that convert electrical energy into mechanical energy.

Squirrel-Cage Rotor

A type of rotor in an induction motor, characterized by its cylindrical shape with conductive bars running the length of the cylinder and connected at both ends by conductive rings, creating a cage-like appearance.

Frequency

The number of cycles (of a repeating event) per unit time, measured in hertz (Hz) in the context of waves or electrical signals.

Synchronous Speed

The rotation speed at which the magnetic field in the stator rotates in synchronous machines, typically equal to the AC supply frequency divided by the number of pole pairs.