Author Question: A step-up transformer doubles a primary voltage 110 V (ac). What is the ratio of the number of turns ... (Read 35 times)

roselinechinyere27m · **on:** Jul 29, 2018

A step-up transformer doubles a primary voltage 110 V (ac). What is the ratio of the number of turns in its primary coil to those in the secondary coil?

A) 1:4
B) 4:1
C) 2:1
D) 1:2
E) 1:8

Question 2

A runner generates 1260 W of thermal energy. If this heat has to be removed by evaporation, how much water does this runner lose in 15 minutes of running? The latent heat of vaporization of water is 22.6 105 J/kg.

A) 50 g
B) 500 g
C) 35 g
D) 350 g
E) 40 g