Question

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?

Answer #1

(a)

The power input is

(b)

the power output is

(c)

(d)

and

(e)

here

hence it is step up transformer

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?

Imagine an ideal transformer with 1.5 A of peak input current
and 9.0 A of peak output current. (a) Is this transformer step-up
or step-down? (b) What is the required peak input voltage if the
transformer is designed for 18 W of power? Show all work.

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 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 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?

6.
A transformer has an input voltage of 120 V(rms) AC with an output
of 12,000 V(rms) AC . The number of wire turns in the primary is
75. An output power of 245 W is required. Assume the transformer is
approximately 100% efficient. Find the
a. Number of wire turns needed on the output side.
b. input current
c. Output current

in a small transformer, the input is marked 120V AC and the
output is marked 9V AC, 350mA. What is the input current,
disregarding power loss to heating?
A) 14 A
B) 470 mA
C) 26 mA
D) 4.7A

What is the voltage output of a transformer used for
rechargeable flashlight batteries if its primary has 525 turns, its
secondary has8 turns, and the input voltage is 112 V?
V
(b) What input current is required to produce a 4.00 A
output?
mA
(c) What is the power input?
W

A)A transformer has a primary with 10 turn and a 120V AC source
connected to it. The secondary has 20 turns. Calculate the voltage
on the secondary
B)A transformer has a primary with 10 turn and a 120V AC source
connected to it. The secondary has 20 turns. Calculate the current
in the secondary
C) A device requires 40W of power to function. Given 120V are
applied to the device, calculate the current through the
device.
D)Calculate the rate of...

7. An ideal transformer steps up 12.0 volts to 125 volts and the
2630-turn secondary supplies 11.5 Amperes.
a) Determine the current in the primary.
b) Determine the turns ratio.
c) What is the ratio of output power to input power?

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