This is a question for electrical Theory

Question 1. A transformer delivers 550V at 80 mA at an efficiency of 90 percent.
If the primary current is 0.8A, find the power input in volt-amperes and the primary voltage.

Question 2. A step-down transformer with a turn ratio of 50,000:500 has its primary connected to 20,000-V transformer line. If the secondary in connected to a 25 ohm load,

Find

a. the secondary voltage
b.the secondary current
c. the primary current and
d. the power output

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Enrollment in the turtle creek elementary school dropped by 5% from 1975 to 1980.960 children attended the school in 1975.how many children attended the school in 1980

Quote:

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Originally Posted by shirley2013

enrollment in the turtle creek elementary school dropped by 5% from 1975 to 1980.960 children attended the school in 1975.how many children attended the school in 1980

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To answer this one, you will need to consider many things. First, is it exactly a 5% drop off or is it maybe 4.95% or possibly even closer to 6%? Why was there a drop off? Did people move out of the area? If they moved, why? Perhaps the neighborhood was becoming too rough. Maybe the teachers weren't doing their jobs well enough so people pulled their kids and did cyber-schooling instead?

Do you see what I mean?