The answer that best suits this should be D
Answer:
Power = 1200 [W].
Explanation:
The efficiency of an electrical equipment is defined as the relationship between the power realized, over the power that is consumed. For this case, they give us the data of consumed power and efficiency in this way we can calculate the power that the equipment performs.
This means that of the 1500 [W], 1200 [W] are actually used to get the job done. This is established by means of the first law of thermodynamics.
Answer:
Closed.
Explanation:
In order for a current to flow, the circuit must be closed; in other words, there must be an uninterrupted path from the power source, through the circuit, then back to the power source. Voltage is sometimes called electric potential and is measured in volts.
Consider the acceleration of a moving object that comes to a stop:
Acceleration = (change in speed) / (time for the change)
The "time for the change" is in the denominator of the fraction,
so the shorter the time is, the greater the acceleration is.
In the limit, as the time for the change gets closer to zero,
the acceleration gets closer to infinity.
Now consider what force is required to produce a certain acceleration.
Force = (mass) x (acceleration) .
The mass of the object is constant. So the more acceleration
you want to give it, the more force you need.
As the desired acceleration gets closer to infinite, so does
the force required in order to produce it.
In order to bring a moving object to an instantaneous stop,
an infinite force would be needed. None are available.