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WorksheetsTransformer
Total questions: 22
Worksheet time: 22mins
A transformer is a device that changes the voltage of
a direct current
an alternating current
What is created continuously when current is flowing through the primary coil?
changing magnetic field
charging secondary coil
step-up the secondary voltage
increase the output power
Which describe transformer
Primary coil – receives input voltage
Secondary coil – produces output voltage
The voltage produced can either increases or decreases
The voltage produced can either increases or decreases by altering
input voltage
output voltage
number of turns of the primary coil
number of turns of the secondary coil
Two types of transformer are
step-in transformer
step-out transformer
step-down transformer
step-up transformer
Name the type of transformer used in the diagram
(a)
12V bulb connected to a 240V power source that through a transformer.
What should be the number of turns in the secondary coil?
(a)
For increasing the voltage (a) is used.
Calculate voltage in the secondary coil based on the information given below.
Vp = 240 V
Np = 20
Ns = 125
Vs ?
(a)
This picture is an example of a (a) .
If a transformer reduces voltage, it is called a....................... transformer.
step left
step right
step up
step down
If a transformer reduces voltage, it is called a....................... transformer.
step left
step right
step up
step down
If a transformer reduces voltage, it is called a....................... transformer.
step left
step right
step up
step down
A step-up transformer has more turns on the primary coil than the secondary coil.
True
False
Transformers only work with ___________ current.
alternating
direct
In a transformer, the input power is __________ the output power.
less than
equal to
greater than
A transformer has 15 turns on its primary coil and 30 turns on its secondary coil. This is a....
step-up transformer
step-down transformer
A step-up transformer has an input power of 75 W. What is the output power?
(a)
A step-down transformer has an input voltage of 50 V. The output voltage will be...
less than 50 V
50 V
greater than 50 V
A step-down transformer has an input current of 50 A. The output voltage will be...
less than 50 A
50 A
greater than 50 A
A step-up transformer is supplied with 100 V from a DC supply. What will the output voltage be?
(a)
The ratio of potential difference across the primary coil to the potential difference across the secondary coil of a transformer is 2:1. The primary coil has 20 turns. How many does the secondary coil have?
(a)
