Some of the reasons AC is used instead of DC to power citties are that I) AC - p

ID: 1452451 • Letter: S

Question

Some of the reasons AC is used instead of DC to power citties are that

I) AC - productions is more environmetally freindly than dc-production/

II) AC can be transmitted at high voltages and low currents

III) DC cannot be generatied on such a large scale as to power cities.

IV) I^2R power losses in transmission lines can be reduce with AC

V) AC voltage and current can be stepped up or down by transformers.

Circle one of the answers below for question 9

A) I,III,V

B) II, III, V

C) III, IV, V

D) II, IV, V

Apply in a transforner Ns/Np = Vs/Vp = Ip/Is

where NS ans Np are seconda dr and primary tunrs

Vs and Vp are secondary and primary volatges

Is and Ip are secondary and prianry currents

also in ideal transformer output P = input P

II) AC can be transmitted at high voltages and low currents

III) DC cannot be generatied on such a large scale as to power cities.

V) AC voltage and current can be stepped up or down by transformers.

these three are coorect w r t

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