Question

Which of the following is an accurate statement? A. Step-up voltage transformers have fewer turns in the primary than in the secondary winding. B. AC generators produce current that's pulsating but always remains positive. C. Step-down voltage transformers have a different number of turns in the primary than in the secondary winding, so they change the incoming voltage to a higher voltage. D. DC generators produce current with a voltage that changes from positive to negative

Answer 1

Answer:

A. Step-up voltage transformers have fewer turns in the primary than in the secondary winding.

Explanation:

A step-up transformer is a transformer that transform a lower voltage in input into a higher voltage in output.

The transformer equation states that:

$\frac{V_p}{N_p}=\frac{V_s}{N_s}$

where

Vp is the voltage in the primary winding

Vs is the voltage in the secondary winding

Np is the number of turns in the primary winding

Ns is the number of turns in the secondary winding

we can re-arrange the equation as

$\frac{V_p}{V_s}=\frac{N_p}{N_s}$

For a step-up voltage,

$V_s > V_p$

so

$\frac{V_p}{V_s} < 1$

which implies also

$\frac{N_p}{N_s}<1\\N_s > N_p$

so, the primary winding has fewer turns than the secondary coil.

Answer 2

Answer:

A. Step-up voltage transformers have fewer turns in the primary than in the secondary winding.

Explanation:

PENN