Question

QUESTION 4

A transformer has 394 turns on the primary coil and 2,382 turns on the secondary coil. The RMS voltage on the primary is 120.0 volts, and the power delivered to the transformer is 33.0 watts. What is the RMS current (milliamps) output from the secondary coil? (State answer in milliamps with 1 digit right of decimal.)

QUESTION 5

Consider a series RLC circuit with a resistor R = 51.0 Ω, an inductor L = 2.28 mH, a capacitor C = 0.330 µF, and an AC source that provides 0.155 volts RMS at 17.1 kHz (kilohertz). What is the impedance (ohms) of the circuit? (State answer in ohms as a whole number with no decimal).

QUESTION 6

An object is placed 17.9 cm in front of a diverging lens of focal length -30.0 cm. A converging lens of focal length 16.0 cm is placed 12.9 cm after the first lens. Where is the location of the final image relative to the second lens? (State answer in centimeters with 1 digit right of decimal.)

Answer #1

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?

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.

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?

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?

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?

current transformer with a bar primary has 250 turns
in it secondary winding. the resistance and reactance of the
secondary circuit are 1.4 ohms and 1.1 ohms respectively including
the transformer winding. when 5A current flows in the secondary
winding, the magnetism mmf is 80 AT and iron lost is 1.1w.
determine the following (i) ratio error (ii) phase angle error

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.

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

Question 27
A. A transformer has an input voltage of 100 V and an output
voltage of 10,000 volts. If the primary coil has 100 turns and the
input current is 2 A, what is the output current, and how many
turns does the secondary coil have?
B. What is the flux through a loop of wire with 20 turns having
a circular shape with a radius of 5.0 cm when it is placed with its
face perpendicular to a...

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