Question

An ideal transformer has 100 turns on its primary coil and 200 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary,

(a) What voltage is present in the secondary?

(b) What current is present in the secondary?

(c) What is the output power?

(d) Is this a step-up or step-down transformer?

(e) Is the input power the same, larger or smaller than the output power?

Answer #1

An ideal step-down transformer has a primary coil of 370 turns
and a secondary coil of 25 turns. Its primary coil is plugged into
an outlet with 115 V(AC), from which it draws an rms current of
0.69 A.
What is the voltage in the secondary coil?
Calculate the rms current in the secondary coil.
Assuming that the transformer secondary is driving a resistive
load, calculate the average power dissipated in the resistor.

a) An ideal step-down transformer has a primary coil of 400
turns and a secondary coil of 14 turns. Its primary coil is plugged
into an outlet with 240 V(AC), from which it draws an rms current
of 0.35 A. What is the voltage in the secondary coil?
b) Calculate the rms current in the secondary coil.
c) Assuming that the transformer secondary is driving a
resistive load, calculate the average power dissipated in the
resistor.

A transformer has 380 primary turns and 1140 secondary turns.
The input voltage is 120 V and the output current is 16.5A . Assume
100% efficiency.
A) What is the output voltage?
B) What is the input current?

A step-up transformer has a primary coil with 100 loops and a
secondary coil with 800 loops. If the primary coil is supplied with
a household current of 120V and 12 A,
(a) what voltage is produced in the secondary circuit?
? V
(b) what current flows in the secondary circuit?
? A

A transformer has 1600 turns on its secondary and 200 turns on its
primary. The primary is connected to a 20V ac source. What is the
output voltage of the secondary in volts?

Seven) An ideal transformer has 25 turns on the input and 400
turns on the output. There is an input voltage of 120V and an input
current of 0.200A.
a. What is the power input?
b. What is the power output?
c. What is the voltage output?
d. What is the current output?
e. Is this a “step up” transformer or a “step down”
transformer?

The primary coil of a transformer has N1 = 340 turns, and the
secondary coil has N2 = 2 190 turns. If the input voltage across
the primary coil is Δv(t) = 170 cos ωt, where Δv is in volts and t
is in seconds, what rms voltage is developed across the secondary
coil?

A transformer has 500. primary turns and 10.0 secondary turns.
(a) If Vp is 120.V(rms), what is Vs? If the secondary now has a
resistive load of 10.0Ω, what is the current in the (b) secondary
and (c) primary? (Hints: Input power equals the output power.
Express power in terms of voltage and current, then use Faraday’s
Law to relate voltage to number of turns and change of flux. If the
primary and the secondary are connected via a closed...

An ideal transformer has 6,000 windings in its primary coil and
10,000 windings in its secondary coil. The primary coil is
connected to an RMS voltage of 480 volts. The secondary coil is
connected to a single 8,000 Ω resistor. What is the current through
the primary coil?

A transformer has 310 turns in the primary coil and 180 in the
secondary coil.
a.By what factor does it change the voltage? Assume 100%
efficiency.
b.By what factor does it change the current?
Express your answer using three significant figures.

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