Atransformer changes 120 v across the primary to 1200 v across the secondary. if the secondary coil has 800 turns, how many turns does the primary coil have?
(a) 40
(b) 80
(c) 100
(d) 400
(e) 4000

the answer is B 80turns

Explanation:

Hello!

Remember that a transformer is an electrical device that allows you to change the voltage and current levels keeping the electric power constant, in this order of ideas the equation that governs this device is as follows

where

Vp= primary voltage=120V

Vs= secondary voltage=1200V

Ns=turns of secondary=800

Np=turns of primary

now we solve for Np

the answer is B 80turns

- measure reactants precisely. ( first choice)

- stir to the reaction take place. ( second choice)

- wait patiently until the reaction completes. ( fourth choice)

- make sure to recover as much copper as possible. ( last choice)

second mirror gathers light from a faraway object and reflects it to another mirror. - a.